Spencer Pratt wasn't all there while filming MTV's The Hills.

'The Hills' Star Holly Montag Is Pregnant, Sister Heidi Wants To Be Next

In a new interview, Pratt and his wife, Heidi Montag, opened up about their former Hills co-stars. When asked which of their co-stars they still speak to, Pratt admitted to losing his mind while filming, which caused him to burn several bridges.

"I talk to Brody a lot," Pratt explained to Wetpaint Entertainment on Friday. Added Montag, "Probably Kristin and Audriana are who I talk to. Obviously Stephanie is number one. We talk to her all day every day, and she has this amazing new boyfriend, Josh."

Is Brody Jenner Getting Engaged To Kaitlynn Carter?

During their time on The Hills, Pratt and Montag began dating, became engaged, eloped and got married. They also managed to cut ties with a number of their friends, including Lauren Conrad, who was Montag's best friend for years. Pratt and Brody Jenner had a falling out, as well, but have since gotten their friendship back on track.

“I pretty much lost my mind, but it’s almost back,” Spencer explained of his time on reality television.

Also speaking of Jenner, Pratt claimed to be working on a couple of "top-secret projects."

Currently, Pratt and Montag are starring on WEtv's Marriage Boot Camp, where they are attempting to hammer out their marital issues, which stem from Montag's desire to start a family, and Pratt's desire to wait.

Tags: Spencer Pratt The Hills MTV Heidi Montag Reality TV