Then and Now

Kristin Cavallari
She was a junior in high school when she taped the first season of MTV's Laguna Beach. She clashed with Lauren Conrad as they both vied for Stephen Colletti. She is still stirring up drama: She angered Audrina Patridge after going after Justin Bobby. "It's fun to play the bitch."

Heidi
When Montag began The Hills in 2006, she was BFFs with Lauren Conrad. She has since ended her friendship with Conrad and wed Spencer Pratt – as well as undergone a nose job and breast implants. Montag, 23, recently told Playboy: "I'm definitely not done with my surgical quest."

Audrina

During her first season of The Hills in 2006, she dated Spencer Pratt before romancing Justin Bobby and Australian BMX rider Corey Bohan. The aspiring actress, 24 — who's back on with Bohan and leaving The Hills after the sixth season — has surgery rumors. "I'm just losing my babyfat," she told Extra earlier this year.

Brody
Jenner (of the 2005 Fox reality show The Princes of Malibu) once romanced Lauren Conrad and Kristin Cavallari. He is now dating Playboy Playmate Jayde Nichole. "Keep an open mind and watch," Jenner, 26, recently told MTV News of The Hills' sixth season.

Stephanie
Before joining The Hills in 2007, Spencer's sister struggled with drugs and later battled bulimia. "I remember saying, 'I can't believe how huge I look walking over to Lauren [Conrad],'" she tells Us. Now healthy and happy, Pratt, 23, has a new outlook on her body: "The more I can stress about being honest, [the better]," she tells Us. "You are as healthy as your secrets."

Lo
She made her reality TV debut during her senior year of high school, appearing alongside BFF Lauren Conrad on MTV's Laguna Beach. Bosworth, 23, is still tight with Lauren (they're roommates!) — and graduated UCLA in 2008. She has said she eventually wants her own talk show. Spencer
He executive produced and starred on the 2005 Fox reality show, The Princes of Malibu, with ex-BFF Brody Jenner. A year later, he joined The Hills and met Pratt, 26, wed Heidi Montag in spring 2009. Are kids next? "I'd love children," Montag recently said, "but Spencer doesn't. Hopefully, that will change, though."