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

Charlie: Oh, try MalibuPuddingGirls.com.
Alan: Pudding Girls?
Charlie: Trust me.
Alan: Oh ... ew.

Chelsea: I just think it's ridiculous that we're engaged and we're not living together
Charlie: Well excuse me for being old fashioned. I'm just not comfortable with us living in sin
Chelsea: So you think we should stop having sex?
Charlie: No no, it's not the sin I object to, it's the living in it