THU: The Alleged Other Man

"Extra" reveals the man at the center of the Billy Joel divorce rumors! Who's the sexy young designer spending time with Katie? Is Billy moving out?

Then, Nia Vardalos' big fat Greek reunion with John Corbett! The former co-stars are cracking up -- and stripping down -- on "Extra"!

Plus, watch "Extra" for your chance to win a trip to NASCAR with Carl Edwards.