Pratt, Montag explain Costa Rica trip

Heidi Montag and Spencer Pratt have been spotted together in Costa Rica.

The Hills co-stars are in the process of divorcing following their split in May, but they were spotted together by TMZ at a resort in the country over the weekend.

Speaking to People, Pratt explained that he was bringing the couple's dogs to Montag and helping them move in, but added: "[Heidi] thought I was going to leave, but I'm not. I didn't want to get divorced... I have nothing in Malibu, I'm homeless, I'm nothing without her."

Montag reportedly told the website that the couple's divorce proceedings were "going smoothly" and they were enjoying an amicable relationship until recently: "We were really getting along and it was amazing he was being so thoughtful to help me move. Then things turned."

She continued to deny the existence of a sex tape that Pratt is allegedly attempting to release, insisting that her estranged husband is "trying to drum up press".

However, Pratt remained adamant that the tape does exist, but added that he would prefer for the footage to remain private.

"I told Heidi... if you don't want to do the new reality show with me, then I'll have to release old footage," he explained. "I can get $5 million from a sex tape, but I really don't want to do that. It's not the way I want things to be. Heidi is furious with me but I need to look out for myself."

It has been suggested that Pratt has two tapes in his possession: one featuring himself and Montag, and one that features Montag and Playboy star Karissa Shannon.