A tantalizing internet rumor caught fire earlier this month, raising speculation that a prominent 'Harry Potter' cast member has fathered a love child, and vexing fans with the mystery: Which star could it be?

Seven famous Brits -- Daniel Radcliffe, Rupert Grint, Tom Felton, Oliver and James Phelps, Jason Isaacs and Alan Rickman -- appear on a 'Potter'-themed postcard that was apparently mailed to postsecret.com, the U.S.-based website run by author Frank Warren, who simply invites readers to send in anonymous postcards confessing a secret. And the sender clearly wanted to get a shocking secret off her chest.

"One of these men is the father of the most amazing little girl in the world," says the unsigned message scrawled on the postcard. "He's never met her. He never will. He probably can't even remember my name."

Tom Felton (Draco Malfoy) has tweeted his reaction: "My friend just found this on the web! Just to confirm that I can be canceled out of this equation LOL!"