Reality TV star Heidi Pratt is not adjusting well to life in the jungle.

The newlywed star of The Hills has broken down in tears and threatened to quit the U.S version of I'm a Celebrity... after spending just hours in the Costa Rican jungle camp.

Heidi and her husband Spencer Pratt have twice walked off the show - which is  co-hosted by British star Myleene Klass - in its first 24-hours.

Before the show, Heidi insisted she would happily munch on kangaroo anus in order to win the show.

She told Life & Style: "I’ll take one for the team. I want to win!"

While Heidi was feeling sorry for herself in the jungle, the rest of the Hills gang - Lauren Conrad, Audrina Partridge and Whitney Port - were enjoying the glamourous surroundings of the 2009 MTV movie awards.