Wiz Khalifa, 28, initiated the Twitter feud seen ’round the world when he called out Kanye West, 38, for his new album title, and although Katy Perry wasn’t involved, she still took a side in the battle! Katy, 31, added a fiery tweet of her own to the social media battle between the rappers in support of Kanye. What made her choose Ye over Wiz? His tight pants, apparently!