Pop princess Britney Spears has finally sold her Manhattan penthouse, after being on the market for more than two years.

The 4,400-square-foot apartment in the famed Silk Building, which she originally put on the market in July 2004 at a rate of around 6 million dollars, was finally sold for 4 million dollars.

Spears had bought the condo in 2002 for 3 million dollars before her marriage to Kevin Federline and the birth of their son, Sean Preston.

The posh pad also boasts a media room, library and terrace.

Previous owners were Rolling Stone Keith Richards and hip-hop mogul Russell Simmons, while Cher was once a neighbour, reports Contactmusic.

Chris Toland of the Corcoran Group, who represented the buyers, told the Wall Street Journal that his clients are from Los Angeles and are "not celebrities."