Robin Tunney, Simon Baker Robin Tunney, Simon Baker

On Sunday's The Mentalist, Jane (Simon Baker) and Lisbon (Robin Tunney) dress to impress as they go undercover to try to trap a team of art thieves. But Lisbon — who cleans up pretty nicely, we might add — has a more difficult time adjusting to black tie attire than Jane does.

Mentalist's Owain Yeoman "very satisfied" with Rigsby and Van Pelt's goodbye

In the exclusive sneak peek below, Jane hilariously instructs his partner to "try a little less Joan Crawford, a little more Barbara Stanwyck."

Lisbon's efforts apparently pay off elsewhere in the episode, when she catches the eye of Special Agent Marcus Pike (Pedro Pascal), who's being introduced as a love interest for Teresa.

Check out a clip from "Violets":

The Mentalist airs Sundays at 10/9c on CBS.

(Full disclosure: is owned by CBS.)