Ashley Tisdale, Sarah Michelle Gellar

On Thursday's episode of The Crazy Ones (9/8c, CBS), Ashley Tisdale guest-stars as Kelsi Lasker, the obnoxious daughter of an important client who gets hired as an intern at Lewis, Roberts and Roberts.

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Check out the exclusive clip below to see the less-than-stellar first impression her character makes on Sydney (Sarah Michelle Gellar), Simon (Robin Williams), Zach (James Wolk) and Andrew (Hamish Linklater). Looks like it's going to be a long three months at the firm!

The Crazy Ones airs Thursdays at 9/8c on CBS.

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