At one moment you can be on top of the 'Big Brother' house, the next at the very bottom. Just ask Kato Kaelin.

Watch the two-night premiere event of 'Celebrity Big Brother' on Monday, Jan. 21, and Tuesday, Jan. 22, at 8 p.m. ET/PT on Global.

Kato Kaelin, who became famous as a key witness in the O.J. Simpson murder trial, was part of a group that won the 50/50 raffle at the game.