Federal marshals seized Ruth Madoff's New York apartment Friday along with the contents of the Manhattan duplex she shared with her swindling husband.

After changing the locks, the five marshals began an inventory of the contents, the New York Daily News reported. The apartment alone, a four-bedroom penthouse on East 64th St., is said to be worth $7 million.

"We are here to officially seize the property," one of the marshals said.

Madoff, 68, agreed last week to forfeit most of her property, keeping $2.5 million.

Bernard Madoff, 71, was sentenced to 150 years in prison Monday.

The News, citing a source in law enforcement, said Ruth Madoff was on the premises when the marshals arrived, quietly surrendered the apartment and left.

Bernard Madoff's Ponzi scheme defrauded investors of billions of dollars. His wife, who worked with him for decades but said she knew nothing of the fraud, had about $70 million in assets in her name, including houses in Palm Beach, Fla., and the Hamptons in New York, as well as two yachts, the newspaper said.