Is Hef’s ex hooking up with Hilton’s former flame?

Good Charlotte’s Benji Madden, who dated heiress Paris Hilton for several months in 2008, is said to be secretly seeing Hugh Hefner’s former Best Bunny, Holly Madison.

The couple has been trying to keep their burgeoning romance under wraps, but Life & Style star snitches say Benji and Holly were spotted canoodling outside a Melrose Avenue coffee shop in Los Angeles as recently as last week.

“He was rubbing her lower back and the top of her butt, and she was hanging on his shoulder. They were laughing and flirting the entire time,” an insider insists.

Benji has kept a low profile on the love front since splitting from Paris last November. Holly briefly dated illusionist Cris Angel after splitting from Hefner last year.