Stars' Hot Bodies: As Seen on Twitter, Instagram

Rihanna

Credit: Courtesy of Rihanna

The "We Found Love" singer thanked designer Matthew Zink on Instagram for making "what has to be my favorite bikini of all time," a tan string two-piece. Also in the Instagram pic, Rihanna showed off her massive ribcage tattoo that honors her late grandmother.

Anna Kendrick

Credit: Courtesy of Anna Kendrick

"I'm bringin' sexy back," Pitch Perfect's Kendrick joked, referencing Justin Timberlake's 2006 hit single "SexyBack" when sharing this snapshot from a trip to Puerto Rico. "'No tans lines' doesn't have scandalous implications for me. I'm basically see-through."

Bar Refaeli

Credit: Courtesy of Anna Kendrick

"I don't feel the need to be super-skinny, but being in shape is important," explains Refaeli, who practices martial arts-based Krav Maga. "My trainer taught me all kinds of kicks and they work everywhere -- your abs, your butt."

The Rock

Credit: Courtesy of Dwayne Johnson

"It wasn't easy. It's a lot of hard work," pro wrestler Dwayne Johnson told USA Today of bulking up to play a bodybuilder in Pain & Gain opposite Mark Wahlberg. The actor said his added muscle appeared much larger on the big screen than it really was. "Onscreen, that small amount of extra pounds translates to 50 pounds, making my character look like an 800-pound silverback gorilla just released from jail."

Emmy Rossum

Credit: Courtesy of Emmy Rossum

 To keep her bikini bod (seen here in a carefree snap posted to Twitter) in perfect shape, the Shameless actress tries to cook for herself as often as possible. "I like making some vegan dishes, although I'm not vegan. I like making scrambled tofu with spinach and rice pilaf in a curry sauce," the actress tells Us. "Lots of good flavors you can add without adding too many unhealthy fats."

Harry Styles

Credit: Courtesy of Danny Simpson

The tattoo-covered singer -- who went shirtless with band mates Niall Horan, Zayn Malik, Liam Payne and Louis Tomlinson in One Direction's "Kiss You" video -- posed for an Instagram pic with English footballer Danny Simpson. After Styles' visit to Newcastle United's training camp, Simpson posted the pic to Instagram with the caption "proper safe guy."

Heidi Klum

Credit: Courtesy of Heidi Klum

"Island speed," the America's Got Talent judge captioned this Twitter shot from a vacation getaway, which showed her lying on her stomach (and flashing sideboob), tanning topless in only black bikini bottoms.

Justin Bieber

Credit: Courtesy of Justin Bieber

How does Bieber maintain his sexy six-pack? "He's pretty good about his diet," his voice coach Jan Smith tells Us. "He eats healthy. He doesn't eat a lot of junk food."

Maria Menounos

Credit: Courtesy of Maria Menounos

"I like to jog and I try to focus on floor-based Pilates to strengthen and lengthen," the super-fit Extra cohost (showing her midriff in a Twitter snapshot) tells Us. "I'm not someone who carries any kind of serious routine. I try to keep a healthy attitude about it. I deal with whatever it is. The most I will do before a beach trip is run a few nights before."

Mariah Carey

Credit: Courtesy of Mariah Carey

Welcoming twins Moroccan and Monroe in April 2011, the American Idol judge dropped 30 pounds in just three months by following a Jenny (formerly Jenny Craig)-approved diet and exercise routine."I feel incredible," the "#Beautiful" singer (pictured here in a Twitter snap from April 2013) said when unveiling her stunning weight loss in Us Weekly. "I'm proud of how hard I worked to get my body back...I had to do this for me."

Miley Cyrus

Credit: Courtesy of Miley Cyrus

No stranger to posting selfies on social media, Cyrus flashed her abs in a Twitter picture, which featured her in a bra top and studded leather jacket. In a recent interview with Elle U.K., Cyrus claimed she doesn't want to oversell her sex appeal. "A star is someone who doesn't have to take her clothes off to be sexy because you naturally have star power," she told Elle. "Sex does sell, but you have to find a way that's not just showing your tits. I don't want to be a glorified model."

Nicki Minaj

Credit: Courtesy of Nicki Minaj

"I don't mind the fascination . . . People are sitting in the barbershop talking about my butt. It's conversational," Minaj (posing in sky high heels and a curve-hugging pink frock on Twitter) told MTV in 2011. "That's what people are gonna do. As long as they're talking about Nicki Minaj, I'm good."

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Taylor Swift, Harry Styles Breakup: New Details Explained in Vanity Fair

Timing really is everything for Taylor Swift and Harry Styles' now-defunct relationship. The former lovebirds were both in Cannes, France, on Saturday, Jan. 26, to attend the NRJ Awards, but the exes managed to time their appearances just right to avoid any potentially awkward run-ins.

Styles, 18, hit the red carpet with his group One Direction and Korean pop sensation Psy first, and Swift, 23, arrived 25 minutes later, sources tell Us .

Harry Styles attends the NRJ Music Awards; Taylor Swift attends the NRJ Music Awards on January 26, 2013 in Cannes, France;
Credit: Marc Piasecki/WireImage; Francois Durand/Getty Images

"It was very carefully timed so they didn't do the carpet at the same time," an insider tells Us. "Taylor didn't do any backstage interviews and didn't use a dressing room -- she changed at the hotel because she didn't want to see Harry at any point. ...Things were timed to keep them apart and for it to not become a big media circus."

Swift dazzled in a short gold-and-white Elie Saab number with a plunging neckline on the red carpet and later changed into a tiny black lace dress with knee-high boots for her performance of her hit, "We Are Never Ever Getting Back Together."

The song, which was reportedly written about one of Swift's other exes, Jake Gyllenhaal, held extra meaning for the country crooner, who reportedly looked directly at Styles -- who was several feet away in the audience -- as she sang her breakup anthem.

"She was talking in French on the microphone saying, 'So he calls me up and he's like 'je t'aime, je 't'aime toujours … je ne sais pas [I love you, I still love you, I don't know]. No! We are never ever getting back together, like ever!'" an eyewitness told Us of her passionate performance.

Swift and Styles famously split earlier this month after reportedly having a huge argument during their holiday getaway to the British Virgin Islands.

"They had a fight," one insider told Us at the time. The British singer had "said something he shouldn't have … This [breakup] is definitely going to be for good."

In a cryptic tweet on Jan. 10, Swift hinted at a new song that she's penning about their public split.

"Back in the studio," she wrote at the time. "Uh oh..."

Styles has not directly addressed the breakup, and in a tweet late Saturday evening, thanked fans for their support as he and his band won Best International Group.

"Thank you so much to @NRJhitmusiconly and our fans for the award!! See you later .xx," he tweeted.

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Taylor Swift Hints She'll Record Harry Styles Breakup Song?

Is Taylor Swift already writing the wrongs of her most recent relationship?

Just days after her split from One Direction boy bander Harry Styles, the "Red" singer was hard at work on a new project.

Taylor Swift, Harry Styles
Credit: Jon Kopaloff/FilmMagic; Dave M. Benett/Getty Images

"Back in the studio," she tweeted cryptically on Thursday, Jan. 10. "Uh oh..."

The 22-year-old's whirlwind romance with Styles, 18, went south last week during a vacation on Virgin Gorda, the largest of the British Virgin Islands, sources told Us Weekly. They had a fight -- after which Swift cut her holiday short and flew solo back to Nashville.



"[Harry] said something he shouldn't have," one insider told Us. "This [breakup] is definitely going to be for good."

"They are 100 percent over," another source said of the couple, who were first spotted together back in November.



The Grammy-winning superstar didn't reveal any further details about her time in the studio, but she's been vocal about the fact that she regularly mines her personal relationships for new material. In the past, she has written songs about famous ex-flames including John Mayer, Jake Gyllenhaal, Taylor Lautner, and Joe Jonas.

"I've always lived by the theory that if a guy doesn't want me to write a bad song about him, he won't do bad things," she told Us in 2010. "And he shouldn't, you know?"

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