Reality TV twits Heidi Montag and Spencer Pratt have quit the US version of I'm A Celebrity...Get Me Out Of Here! - apparently for good this time.

After threatening to bail and being persuaded to stay TWICE during the first twenty-four hours of jungle life, the couple walked out again shortly after the first episode aired on US TV.

The newlyweds were sent into the Costa Rican jungle with former supermodel and jungle pro Janice Dickinson, and hasbeen actors Stephen Baldwin and Lou Diamond Phillips at the weekend in preparation for the celebrity survivor competition.

They allegedly threatened to walk from the set immediately afterwards after deciding they wanted to go home, but were convinced by NBC TV executives to stay and battle on.

However, TMZ reports that Heidi and Spencer walked out of the show late on Monday after the season's first live telecast.