Boo Gazing: Celebs Out & About: Mariah Carey, Jay-Z, Usher, Kelly Rowland and more

Singer Mariah Carey poses for Jenny Craig to celebrate new relationship with the American Heart Association

Model Christine Teigen and John Legend walk the red carpet for the International Rescue

Zoe Saldana arrives at the 12th Annual Latin GRAMMY Awards

Booty pop Adrienne Bailon arrives at the 12th Annual Latin GRAMMY Awards

Singer Usher arrives at the 12th Annual Latin GRAMMY Awards held at the Mandalay Bay Resort

Mel B and Stephen Belafonte attend the WHO 'Sexiest People' Party at The Great Hall, University

Jay-Z looks a little sleep-deprived as he strolls down the sidewalk in Tribeca.

Christina Aguilera arrives for The Elder Scrolls V: Skyrim video game launch event at Belasco Theatre, that hair looks so damaged and brittle. But those boots are the business!

Shakira attends the Shakira Hollywood Walk Of Fame Ceremony

X Factor judge Kelly Rowland gives a wave to the cameras as she leaves the show's London studio.