Lady Gaga serenaded old-school crooner Tony Bennett on Sunday night at Roseland Ballroom.
Spies said the “Applause” singer climbed a ladder covered in vines and roses up to a special balcony where Bennett had a front-row seat.
She sang to him, wearing a racy red leotard, ripped fishnets and leather boots.
The pair performed together on Bennett’s 2011 album “Duets II,” and Bennett famously drew a nude sketch of Gaga in a session captured by photographer Annie Leibovitz for Vanity Fair.