The Associated Press

It's hard enough living in a camera-filled house for three months with strangers. Now imagine if your ex-flame is one of them. That's the twist CBS is using for the fourth season of Big Brother, which premieres Tuesday.

Houseguests vote each other out one by one. The last gets $500,000.

"The only certainty is that everyone involved will be shocked and will likely have to rethink their strategy," executive producer Arnold Shapiro said.