Ashley Tisdale guest stars in Valentine's Day episode of 'Raising Hope'

Jimmy might finally get the girl of his dreams in Tuesday's Valentine's Day episode of Fox's "Raising Hope," in which Ashley Tisdale guest stars.

In "Jimmy's Fake Girlfriend," airing at 8:30 p.m., Sabrina (Shannon Woodward) gets more serious with Wyatt, putting Jimmy (Lucas Neff) in a funk. So Virginia (Martha Plimpton) and Burt (Garret Dillahunt) convince him that he'll make her jealous by creating a fake girlfriend.

"Your father was a tobacco-chewing jackass on a mini-bike when we met," Virginia says. "Half the reason I liked him was because somebody else had him."

At Barney's improv class, Jimmy meets Mary-Louise (Tisdale), who agrees to pretend to be his girlfriend. But Jimmy's plan backfires when he and Mary-Louise are so convincing Sabrina believes them and makes an unexpected decision.

It's another sweet, surprising episode of the good-natured sitcom.