Mario Anzuoni /Landov

When Katy Perry opened the box to reveal the Favorite Movie Actress Award at Saturday night’s Kids’ Choice Awards (Miley Cyrus took home the title) she was caught with a signature Nickelodeon surprise—a dose of bright green slime! Before her unfortunate sliming, the bride-to-be, in a blue wig and ultra minidress dress by the Blonds, was all smiles on the red carpet dishing about her upcoming nuptials to comedian Russell Brand. “I’m preparing a little bit here and there. I have to stop eating McDonalds and start my dance classes,” the singer told us. “[Russell] likes to buy those bride magazines. He’s a bridezilla! He wants everything to be monogrammed. I’m like, ‘You plan the wedding!’” While she hasn’t picked out a gown yet, she did tell us what designer she leaning towards: “Well, the Blonds did my dress today and I love them.” Watch Katy Perry get slimed after the jump!

See more photos from the Kids Choice Awards.

— Joyann King, with reporting by Lindzi Scharf