Katy Perry is gearing up for a big bash following the Grammys. According to Radar Online, the “I Kissed A Girl” singer is throwing a post-Grammy party with Claus Hjelmbak at the Style Mansion. “I have ...

Katy Perry is bringing someone special as her date to the Grammys on Feb. 13—and we’re not talking about hubby Russell Brand. "My grandma, who is 90 years old, is going to come with me," the pop star ...