The singer presented the favorite movie actress award along with Jonah Hill at the show, which aired live from L.A.'s Pauley Pavilion on Saturday night. When she opened the envelope to announce Miley Cyrus as the winner, she was hosed with the network's signature bright green slime.
Cyrus scored the award for Hannah Montana: The Movie. When she walked onstage to accept, Perry motioned to give her a hug before backing away.
"Thank God we both wear wigs," Cyrus joked, before adding, "Thank you, Katy, for not sliming me."
Also on the winners' list: Wizards of Waverly Place star Selena Gomez (favorite TV actress), Alvin and the Chipmunks: The Squeakuel (favorite movie) and New Moon's Taylor Lautner (favorite movie actor).
Lautner also scored one for Team Jacob by winning the cutest couple award with his Twilight costar Kristen Stewart, who was also nominated in that category with Robert Pattinson.
"I have to admit, I have always dreamt of winning one of these orange blimps," said Lautner of the favorite actor award. "Seriously."
But if he's always dreamed of getting slimed, he'll have to wait. Lautner finished the show squeaky clean.