Kelly Rowland's Sexy Abs: How to Get Them in Just Minutes at Home

Singer Kelly Rowland is dedicated to keeping her abs fab -- and it shows!

Working with celebrity trainer Jeanette Jenkins, the former Destiny's Child star can't get enough of abdominal exercises, which work her core muscles. "I use my core for everything. Absolutely everything," Rowland tells Us Weekly about the importance of keeping those muscles fit. "When I'm dancing on stage, when I'm walking around. I have to make sure that my core is strong, it's tight."

To score the "Down for Whatever" singer's sexy abs, try these two easy moves -- the V-Up and Bicycle Curl -- as demonstrated by Jenkins in the video above.

Singer Kelly Rowland perform during the Mercedes-Benz China Fashion Week Grand Opening at 751 D.Park Tank zone on October 24, 2012 in Beijing, China.
Credit: Lintao Zhang/Getty Images

"Before you know it, your abs are going to be looking amazing!" says Jenkins, who suggests doing 15 V-Ups and 20 Bicycles to complete one full set.

Watch the video above now for Jenkins' at-home tips for flat abs fast!

Karina Smirnoff Shows Off Super-Toned Abs in Skimpy Blue Bikini: Picture

Bikini season is still months away, but Karina Smirnoff is already in ab-solutely fantastic shape.

On Sunday, Dec. 30, three days before her 35th birthday on Jan. 2, the Dancing With the Stars pro showed off her beach body in a sexy, blue, halter-style two piece with printed side-tie bottoms. Posing poolside in Miami, Fla., the Ukrainian-born beauty revealed her washboard abs and long, lean legs.

Strutting her stuff comes naturally to Smirnoff, who finished fifth in DWTS' recent All-Star season, for which she was partnered with Olympic speedskater Apolo Anton Ohno.

And fans of Smirnoff will soon get to see yet another side of her when she makes her big-screen acting debut in a new movie written and directed by her Season 12 DWTS partner, Ralph Macchio.

"It is a dream come true to have this opportunity in working with Ralph again," she told Us Weekly of the film, in which she plays a beautiful yet troubled woman who becomes the object of a young boy's fascination. "He wrote such an inspiring script, and I'm grateful to be a part of it. The story is sweet but profound, and my character is very compelling. I'm loving the process!"

Olivia Palermo Shows Off Toned Bikini Body, Packs on PDA With Johannes Huebl

As Olivia Palermo and Johannes Huebl know, there's no better place to spend the holidays than St. Barts.

The genetically blessed couple showed off their toned and tanned beach bodies while vacationing in the French West Indies. (Other celebrity couples who have recently visited the Caribbean island include Ellen DeGeneres and Portia de Rossi, Channing Tatum and Jenna Dewan-Tatum, Naomi Watts and Liev Schreiber and Rachel Zoe and Rodger Berman.)

Olivia Palermo and Johannes Huebl were seen in Saint Barthelemy, France on December 29, 2012.
Credit: Maxppp /Landov

Palermo -- a New York City socialite who appeared on MTV's reality series The City for two seasons -- looked more in shape than ever wearing a strapless navy blue bikini, a gold cuff and wayfarer sunglasses Dec. 30.

The day prior, the fashion blogger, 26, shared a passionate kiss in the water with Huebl, a 6-foot-2 German model who's worked for DKNY, J Brand and Hogan Eyewear.

BAUER-GRIFFIN.COM
Credit: Olivia Palermo and her model boyfriend Johannes Huebl enjoy day at " Saline Beach" St Barthelemy.

Palermo and Huebl have been dating since 2008, though the latter never appeared on her MTV reality show. "We met through mutual friends -- and they're still our dearest friends," Palermo told ELLE in 2011.

The fashionista has since learned to speak "a little" German to keep up with her beau. "It's cute when she sometimes surprises me with little phrases," Huebl told the magazine. "I think we have a very conservative, conventional, old romantic private approach in our love."

Sean Penn, 52, Goes Shirtless to Reveal Shockingly Muscular Body

Who knew Sean Penn was hiding this body under all that talent?

The 52-year-old Gangster Squad star revealed his surprisingly sculpted physique when he hit the beach in Hawaii on Tuesday, Jan. 1. Shirtless and sporting navy blue swim trunks, the two-time Oscar-winner showed off his rock-hard abs and muscular biceps as he strolled along the shore kicking up sand and soaking up sun.

Penn, who has been linked to Scarlett Johansson and supermodel Petra Nemcova since splitting from wife Robin Wright in 2010, certainly looked carefree, but as he told Esquire recently, he's had to acknowledge some uncomfortable truths about his life in the last few years. He recently opened up to the magazine about facing bachelorhood again in his fifties and coming to terms with the end of his second marriage. (The actor was also wed to Madonna from 1985 to 1989.)

"There is no shame in saying that we all want to be loved by someone. As I look back over my life in romance, I don't feel I've ever had that," he says. "I have been the only one that was unaware of the fraud in a few of these circumstances blindly."

"When you get divorced, all the truths come out, you sit there and go, 'What the f--- was I doing? What was I doing believing that this person was invested in this way?'" he adds. "Which is a fantastically strong humiliation in the best sense."

Kourtney Kardashian Loses 44 Pounds in 6 Months: How She Got Thin!

Six months after the birth of her second child, E! reality star Kourtney Kardashian is back in a bikini -- and proudly showing off her 44-pound weight loss in a series of unretouched pictures for Us Weekly!

Posing poolside in Miami Dec. 13, the Kourtney and Kim & Take Miami star shared her diet and fitness secrets in a full-length interview with West Coast Bureau Chief Rebecca Bienstock.

"It was harder to lose weight the second time around," admitted Kardashian, mom to son Mason, 3, and daughter Penelope, 6 months (with partner Scott Disick, 29). "I gained 45 pounds with Penelope."

Now a lean 106 pounds, the 5-foot star credits pro Tracy Anderson's 90-minute dance-focused workouts and small portion sizes for helping her slim down in record time. "This time, the focus is really on being a mom and being present, knowing my priorities," Kardashian, 33, told Us.

For details on how Kardashian got her post-baby body back -- and her thoughts on marriage and having a third child -- pick up the new issue of Us Weekly, on stands Friday!

Zoe Saldana, Ashley Benson Offer Best New Year's Eve Hangover Remedies

DIY detox!

Ahead of Monday's night of New Year's Eve parties, Us Weekly asked celebs including Zoe Saldana and Pretty Little Liars' Ashley Benson to share their top tips on how to recover after a major bash. Plus, experts weigh in on the post-partying tricks the celebs swear by.

ZOE SALDANA TELLS US: "Before going to bed, I put Epsom salts into a warm bath and soak for 15 minutes. The next day I wake up with half the night erased."
WHAT THE EXPERT SAYS: Magnesium sulfate (a.k.a. Epsom salt) can reduce bloating by drawing fluids out of the body, says Laura Ann Conroy, an aesthetician for Bliss. For morning-after puffiness, smooth on the Body Shop's Spa Fit Gel Massager. Its grapefruit essential oils help flush water out of the system. ($30, thebodyshop.com)

ASHLEY BENSON TELLS US: "I refresh my skin with a cucumber mask, followed by a lot of moisturizer."
WHAT THE EXPERT SAYS: NYC-based dermatologist Dennis Gross maintains that cucumber extract helps attract and bind moisture to skin. No cuke-infused potions in the medicine cabinet? Apply Dr. Jart's Water Fuse Water-Full Hydrogel Mask for 15 minutes. "The cool-to-the-touch patch drenches skin cells with hydrating hyaluronic acid. ($42 for five, sephora.com)

LIV TYLER TELLS US: "Hair of the dog always works. A nice breakfast is also very important."
WHAT THE EXPERT SAYS: Skip the alcohol. "It just delays the inevitable," says physician Frank Lipman, founder of NYC's Eleven Wellness Center. Breakfast, however, is key: "Eggs contain cysteine to break down toxins and make you feel less sluggish." At the very least, take a supplement like CocoaWell, which contains cocoa powder, a natural energy stimulant. ($30, Whole Foods)

ALLISON WILLIAMS TELLS US: "The smell of rosemary in my eye cream wakes me up. It's pretty spectacular and helps diminish dark circles after a late night of partying."
WHAT THE EXPERT SAYS: Though rosemary is a proven antioxidant, vitamin K constricts blood vessels, helping under-eye circles diminish faster, notes Leighton Meester's facialist, Micheline Reboh of NYC's Paul Lebrecque Salon and Spa. Try Peter Thomas Roth's Eye Rescue. ($100, peterthomasroth.com)

SHAY MITCHELL TELLS US: "To get rid of swelling around my eyes, I put green tea bags on my eyelids. Or I grab cold spoons that I leave in the freezer and put them on my eyes."
WHAT THE EXPERT SAYS: "Green tea contains anti-inflammatory caffeine," explains Anna Faris' Dallas-based facialist, Renee Rouleau. "And anything cold reduces puffiness when applied for 10 minutes." Clinique's All About Eyes Serum delivers a one-two punch: a caffeine-rich formula dispensed through an icy metal tip. ($28, clinique.com)

Tell Us: What's your best hangover remedy?

Ashlee Simpson Wears Tiny Bikini, Plays on Beach With Son Bronx, CaCee Cobb and Donald Faison: Pictures

Ashlee Simpson is one hot single mom!

Ashlee, 28, showed off her lean, toned body in a tiny string bikini while playing on the beach with son Bronx, 4, and a pal on Saturday, Dec. 29 in Hawaii. The mother-and-son duo held hands as they splashed around in the water together and soaked up the sun.

They were also joined by sister Jessica Simpson's BFF CaCee Cobb and her new husband, Donald Faison. Cobb, 35, and Faison, 38, tied the knot on Dec. 15 with the whole Simpson family in attendance.

Donald Faison and Bronx Mowgli Wentz
Credit: Splash News and Pictures

Jessica, who is expecting her second child with fiance Eric Johnson, tried to hide her baby bump while serving as maid of honor in the ceremony. The Fashion Star mentor, 32, finally confirmed her pregnancy on Christmas Day by sharing a photo of daughter Maxwell, nearly 8 months, sitting on the beach with "Big Sis" written in the sand.

Johnson, 33, was photographed going for a bike ride with the Scrubs actor Saturday, but the second-time mom-to-be apparently didn't tag along.

Eric Johnson and Donald Faison ride their biycles
Credit: Aik Arshamian/INFphoto.com

The pair, engaged since November 2010, recently put an offer on a house in Hidden Hills, California, for their growing family. And the NFL pro is also settling into domesticity. "He is amazing with Max," a source told Us Weekly. "Eric tells Jessica he has everything he's ever wanted."

A source also told Us that Simpson "is super in love" with Johnson. "Jessica is so content right now and really into family life with Eric."