The "Stay" songstress popped up with the bold hair hue in an ad for her new Mac Viva Glam campaign, sporting a matching green dress while she was at it. "Check out my new @MACcosmetics #VivaGlam ad. All sales go to people affected by HIV/AIDS. Comin @ ya this September!!," she she retweeted and captioned a shot of herself hanging out with Eminem backstage.
The show kicks off Thursday at the Rose Bowl in Pasadena, Calif.