Madsen Enters Britain's Celebrity Big Brother House

Reservoir Dogs star Michael Madsen has been placed under 24-hour observation - he has become a contestant on British reality show Celebrity Big Brother.

The Hollywood star, who has also appeared in Sin City and Kill Bill, walked into the house on Thursday night (05Jan12), insisting his stay wouldbe like a previous stint in rehab.

He quipped, "I don't know f**k all about Big Brother. But it's gonna belike rehab without the doctors".

Madsen was joined by Playboy twins Kristina and Karissa Shannon and British rapper Romeo Dunn.

U.K. soap stars Natalie Cassidy and Denise Welch were also among the star contestants, while retired, gay rugby star Gareth Thomas, who is to beportrayed on the big screen by Mickey Rourke, is also part of the new season's line-up.

The celebrities follow in the footsteps of Tara Reid, Stephen Baldwin and Pamela Bach, who have all previously taken part in the show.