Celebrity Kristin Cavallari posses in a sexy bikini for a photo shoot. Showing off her foxy figure, Kristin Cavallari happily strapped on a little yellow bikini for a recent photo shoot session. The "Hills" hottie headed poolside over the weekend for her work duties, smiling as a lucky photographer busily snapped up shots. In related news, Miss Cavallari recently chatted with press about her take on co-stars Heidi Montag and Spencer Pratt’s recent split.

She tells, "I don’t even know if it’s real or not. I don’t believe a word that comes out of their mouths, to be honest." Biting words from Kristin Cavallari, The Hills co-star to Heidi Montag. Kristin Cavallari is also up for a teen choice award. Going up against her for the award is fellow co-star Lauren Conrad and MTV’s smash hit Jersey Shore Star "Snooki".

It is official that Heidi Montag and husband Spencer Pratt are splitting up after 19 months of marriage. Heidi Montag confused everyone with a tweet she made on her twitter account earlier on in the week.  "I am not Heidi Pratt, I am Heidi Montag". Well later on it became clear that The Hills Star is Heidi towards splits-ville. "Heidi is looking to move out due to all the fake bad press that Spencer controls. She’s tired of it and is looking for a place and wants to focus on her acting career," a rep for Montag told TMZ, adding that she’s currently searching for her own home in Malibu.

"Due to all the negative press lately, they have decided to lay low for a while," said Spencer’s rep. A source close to the couple isn’t surprised by the split, but surprised Miss Montag is finally making the move. "I’m so happy for her," said our insider. "He was such a bad influence." Another Pratt family friend agreed. "I think the American public would agree they’re better off apart. Heidi is off in her own crazy little world and Spencer is certifiably insane," said the source. "Heidi was his little puppet and its great that she is finally (separating from him). Their relationship always seemed so forced." Well the rain of Ken and Barbie, aka Heidi Montag and Spencer Pratt is finally over.

Kristin Cavallari, Stephanie Pratt, and Audrina Patridge led The Hills cast during a beach bikini romp in Costa Rica today. All three of them were sporting some pretty sexy bikinis. All the girls including Stacey the Waitress were out on the sand, and then exploring a near-by waterfall. Tagging along with the group of bikini girls was a shirtless Brody Jenner. They were shooting some scenes for the final episode of the season.

Not with the cast of The Hills was Heidi Montag and Spencer Pratt. The Dynamic Duo, who love some skimpy get ups, have ostracized themselves from the rest of the crew this season. Audrina Patridge, Kristin Cavallari, and Stephanie Pratt have all hosted Las Vegas pool parties so far this Spring season, but now it gets a little more exotic in there Central American shooting location.