They had one of the most tumultuous marriages in Tinseltown history, but Madonna and Sean Penn showed nothing but love for each other last night (September 24) in New York City.

The “Like a Virgin” songstress invited her “Mystic River” actor ex-hubby to attend the launch of her Secret Project Revolution film premiere at the Gagosian Gallery, and thankfully he obliged.

And according to eyewitnesses, there’s still quite a spark between the former spouses, who divorced back in 1989.

One source told press, "Their chemistry was off the charts. Madonna seemed to be performing entirely for Sean. And he was saying things like 'Amazing!' and 'She's so hot!'"

Another insider added, “Madonna's friends wish she'd get back with Sean. He will always be the love of her life."

Of her new film, Madge told the audience, "We were banned by the Vatican. What a shocker. This film, aside from my children, is the most important thing I've ever done. I cannot tolerate it when groups like Pussy Riot are thrown in jail for criticizing people for their art. This is a serious offense to me because god made art. It's an artist's job to shape the world he or she lives in."

Also in the house for the big shindig were Lindsay Lohan, Zachary Quinto, and Anderson Cooper.