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November 14, 2014 at 10:00 PM EST

Alyson Hanni

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an is returning to CBS: The How I Met Your Mother star has booked a guest-star appearance on the network’s newest comedy, The McCarthys.

Hannigan will appear in the show’s Christmas-themed episode airing Thursday, Dec. 18.

She’ll play Pam, Marjorie and Arthur’s upstairs tenant “who is sweet, but fresh from a break-up and broken-hearted. In order to cheer her up, Marjorie invites Pam to join the family for Christmas Eve, however, as Pam watches the McCarthys play their very competitive annual gift-exchange swap, she is shocked by how the family treats each other.”

Hannigan played Lily Aldrin on HIMYM and also appeared in Buffy the Vampire Slayer and the American Pie franchise.

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