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Ashton Kutcher, Hilary Duff

Warner Bros., AKM-GSI

Two and a Half Men will soon be plus one pretty lady. And she'll be romancing Ashton Kutcher!

Hilary Duff is set to guest star in the season finale of the CBS comedy, E! News has confirmed.

The new mom will play Stacey, a love interest for Walden (Kutcher). But in a twisted turn of events, he ends up falling for her grandmother, played by Taxi and Celebrity Apprentice star Marilu Henner.

Did you see the episode of The Office where Jim, Pam and Andy watch a bootleg movie that has Jack Black falling for his girlfriend's (Jessica Alba) grandmother, who is played by Cloris Leachman? It might be like that.

TVLine first reported news of Duff's and Henner's casting.

Two and Half Men's season finale will air May 9 on CBS.