Socialite and former Andy Warhol protégée “Baby Jane” Holzer was duped into forking over $220,000 for a stolen piece of pop art made by the late artist, she testified yesterday.

Holzer was testifying in Manhattan Supreme Court against James Biear, who is charged with stealing Warhol’s “Heinz 57” crate from an ailing millionaire.

Biear is accused of swiping the wooden box — a silk-screened replica of a ketchup crate — while working for poet Kenward Elmslie, a grandson of newspaper magnate Joseph Pulitzer.

Biear, 50, was hired as Elmslie’s driver in 2005 and quickly embarked on a brazen scheme to loot the 76-year-old’s money and valuables, prosecutors claim.

Holzer bought the crate for $220,000 and paid another $20,000 to have it restored, she said in testimony.