Heidi Pratt used to eat ants? Watch your back, Spencer

"I know she's gonna win," says Holly Montag at the MTV Movie Awards about her sister, Heidi Montag, letting it slip that Heidi and her new hubby Spencer Pratt are actually competing against each other in the "I'm a Celebrity ... Get me Out of Here" reality show.

But they have formed something "like an alliance." Are we surprised?

"I have seen my sister build fires and eat ants ... that was growing up, for fun. She has a much better chance than anyone is giving her credit for," Holly says.

See, you just never know what a person is capable of.

Be careful, Spencer.