Hilary Duff to Guest Star on Two and a Half Men Season Finale

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Hilary Duff has signed on to romance Ashton Kutcher.

The actress - who has recently guest-starred on Gossip Girl and Raising Hope - will stop by the Two and a Half Men Season 10 finale as Stacey, a love interest for Walden Schmidt.

But here's the twist: Kutcher's billionaire will end up falling for the character's grandmother, to be portrayed by Celebrity Apprentice star Marilu Henner.

Hilary Duff at NYU

The Two and a Half Men finale airs on May 9.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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Two and a Half Men Quotes

Jake: Can I go back to mom's tomorrow?
Alan: Why?
Jake: I want to hang out with my friends.
Alan: What, all of a sudden your father's not good enough for you?
Jake: It's not "all of a sudden."

Alan: Since when do you have a wet suit?
Charlie: Since I moved to the beach and noticed it was full of hot surfer chicks. If I lived next to Jellystone Park I'd have a bear suit and a picnic basket