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: If drinking makes you feel bad, why do you drink?
Charlie: Nobody likes a smart ass, kid.
Jake: You have to put a dollar in the swear jar. You said "ass."
Charlie: Tell you what. Here's a twenty. That ought to cover me until lunch

Woman [to Charlie about Jake]: You guys are really great together.
Charlie: Thanks.
Woman: Your wife must be proud.
Charlie: Oh, no, I'm not married.
Woman: Too bad.
Charlie: Wow, you're even better than a dog