A wrap party for the 15th season of “Law & Order: SVU” turned into an unexpected renewal bash Wednesday.

Stars of the long-running crime show — including Mariska Hargitay, Christopher Meloni and Richard Belzer — were spotted at Bowlmor Chelsea Piers after shooting ended on their season finale, spies said.

But none of the stars was sure the show would definitely return — until 7 p.m., when producer Warren Leight informed the bash that NBC agreed to bring the show back.

“It made it a special wrap party,” Belzer told us when we spotted him lunching at Michael’s on Thursday, along with Sony/ATV’s Martin Bandier, Steven Rattner, Showtime’s Matt Blank and Richard LeFrak.