Battle of the Besties: Katy Perry & Rihanna Flaunt Bold Hair

Katy Perry and Rihanna may have been in different parts of the world, but the BFFs proved how much alike they really are when they debuted crazy-colored hair over the weekend. Smokin'-hot Ri-Ri showed off her fire engine-red coif when she performed at the Rock in Rio Madrid Festival. Katy, who will voice the part of Smurfette in an upcoming movie based on the cartoon, donned a blue wig at the MTV Movie Awards in Los Angeles.

We're not feeling either lady's looks! How about you? Weigh in by casting your vote below!