The singer muscles her way through London after a visit to the gym. Plus: Reese & Jake, Jennifer Lopez, Gwen Stefani and more
Credit: Kevin Mazur/WireImage
Published: Monday Mar 31, 2008 | 04:00 PM EDT
More from PEOPLE
- Is This Week's Best-Dressed Star a Little ... Snoozy?
- Angelina: Getting Double Mastectomy Was the 'Right Thing to Do For Our Family'
- Ashley Hamilton: I Struggled with Anorexia and Bulimia
- Ancient Creature with Scissor-Like Claws Is Named After Johnny Depp
- Christoph Waltz Rushed Off French Talk Show After Sounds of Gunfire