PHOTOS: Halle Berry, John Mayer Help Alicia Keys Keep a Child Alive

Alicia Keys drew some A-list star power to Manhattan's Hammerstein Ballroom on Thursday night when she and Padma Lakshmi co-hosted the 6th Annual Keep a Child Alive Black Ball. In addition to celeb guests like Halle Berry, Adrian Grenier, Usher and many more, Alicia also performed onstage with John Mayer and Chris Martin from Coldplay.