Kevin who? Photos: Mavrix Online | X17online

When Kevin Federline and Britney Spears first split, we worried that our favorite pop star had peaked.

It looked like the low-pantsed former backup dancer/baby daddy was going to be the one with the last laugh, while Brit suffered public humiliation after humiliation.

That was, until Federline's attempt at a rap career failed miserably. Um, "PopoZao." Enough said.

Now, he has really let himself go, see above photo of the previously flab-free Federline.

Meanwhile, back at the circus, Spears is flaunting her smokin' bikini body at every chance she gets (including wearing a two-piece to present David Letterman's Top 10 List).

Guess we know who's laughing now...

Check out more stars in bikinis below:

http://xml.channel.aol.com/xmlpublisher/fetch.v2.xml?option=expand_relative_urls&dataUrlNodes=uiConfig,feedConfig,entry&id=558890&pid=558889&uts=1252016848
http://cdn.channel.aol.com/cs_feed_v1_6/csfeedwrapper.swf
Sexy Stars in Bikinis
Britney Spears is back in the zone with her bodacious new bod in this blue bikini. Click on to see more stars in tiny two pieces.
Lory Ayala, BuzzFoto/FilmMagic.com
Phil Walter, Getty Images

Stars in Bikinis

    Britney Spears showed off her newly ripped body in this blue bikini while hanging poolside with her son Jayden at The Ritz-Carlton Hotel in Marina del Rey, California on August 16. The blonde pop star delivered David Letterman's Top 10 List in an itty bitty two-piece days later. Britney must be loving her new svelte look! Let's see how long she maintains it.

    Lory Ayala, BuzzFoto/FilmMagic.com

    Natasha Henstridge, 34, who recently admitted to engaging in extreme diets and taking pills during her modeling days, embraces her new fuller figure in a brown bikini while strolling along the beach in Malibu.

    Joseph Mehdi

    Nicollette Sheridan, 45, flaunts her fabulous figure in this white and blue swimsuit with matching coverup on Malibu beach.

    Flynet

    X Factor J. Lo happily waves to a friend in a bikini as she vacations in Capri, Italy with husband, Marc Anthony, and designer friends Domenico Dolce and Stefano Gabbana.

    Splash News

    Jessica Alba soaks up the Malibu surf in a pink, black, and gray striped swimsuit.

    Splash News

    Katy Perry leaves the ruffles for her suit (and not the paparazzi) in a soft pink bikini and sparkly headband at Miami's Fontainebleau Hotel.

    Splash News

    No "reservation road" here. Actress Jennifer Connelly looks fab in a skimpy black bikini while vacationing with her family in Bora Bora.

    Splash News

    Howdy! Lisa Rinna, 46, shows off her hot bod in this brightly colored Ed Hardy bikini on Malibu beach.

    Splash News

    Mama Was A Rolling Stone! Fifty-three-year old mother (and former wife of Mick Jagger) Jerry Hall frolics on the beach in St. Tropez wearing a black lace bikini.

    Stuart Morton, FilmMagic.com

    Boho Mama Nicole Richie shows off her growing baby bump in a black two-piece swimsuit while strolling along Malibu Beach with boyfriend Joel Madden.

    Splash News