Ryan Seacrest Sells Fabled Mansion

Ryan Seacrest has just sold the mansion he called home before upgrading to Ellen DeGeneres' sick pad ... TMZ has learned.

The 8,000 square foot house -- which has a detached nightclub -- was listed for $12.9 million and sold for $11 million. Sounds great, except Ryan paid $11.5 million when he bought it back in 2006. Blame the housing market ... but we're guessing it's not going to make a dent in Ryan's wallet.

The sale became official this morning. The new buyers are some rich English folk.

By the way, Ryan bought the house from Kevin Costner. Kevin purchased it from Richard Dreyfuss.

Ryan and Julianne Hough are now living in Ellen's former mega-mansion, which he purchased for a cool $37.5 million.