There's no character quite like Molly Shannon's Mary Katherine Gallagher, so in honor of the actress's birthday this week, we're taking a look back at some of her iconic character's hilarious — and hilariously awkward — moments in Superstar. Shannon first introduced the world to the clumsy Catholic schoolgirl on Saturday Night Live [1], and in 1999, Mary Katherine Gallagher made it to the big screen with the movie Superstar, which costarred Will Ferrell [2] as cheesy high school hunk Sky Corrigan. The film featured Mary Katherine's most memorable antics, including the midconfession monologues, the tree-bark makeouts, and the sweet, sometimes heartbreakingly vulnerable moments that make the character so lovable. To celebrate Shannon's 50th birthday on Tuesday, take a look at 17 times Mary Katherine Gallagher gets wonderfully, hysterically weird.