Bodog Beat

Former "Brady Bunch" star Christopher Knight is not grateful for the best gift ever. (Courtesy VH1)

Christopher Knight has threatened to end his marriage to hot model Adrianne Curry after she posed for a girl-on-girl photo shoot for his birthday gift.

Of course, the action was caught on camera for the couple's reality show "My Fair Brady… Maybe Baby" and the dramatic episode will air in January. Apparently, when Knight got wind of the sexy photo shoot he told Curry, "It is the physicalisation of my worst fears. It creeps me out. I want a separation."

The couple met on "The Surreal Life" in 2004. Twenty-four-year-old Curry had earned quasi-fame as the first winner of "America's Next Top Model," while 49-year-old Knight had played Peter Brady in "The Brady Bunch." The couple was married in May of 2006 at the Christ Episcopal Church in Curry's hometown of Joliet, Ill.

Adrianne Curry will grace the cover of the January 2008 Playboy Magazine's Holiday Anniversary Issue.