Spotted: Lady Gaga Meets Alice Cooper

Every day a multitude of stars wander through the halls of MTV News to talk about their latest projects and goof around with our intrepid correspondents. But sometimes we catch stars elsewhere, and that's why we put together Spotted!, a daily compendium of stars in the wild.

Over the weekend, Lady Gaga's Monster Ball tour made a stop in Phoenix, Arizona for another fantastically theatrical presentation of her excellent batch of pop songs. This particular stop was extra special because it was attended by a recent inductee of the Rock and Roll Hall of Fame, as Alice Cooper (who makes his home in the Arizona desert) visited the venue to check out the show. Cooper, who in many respects is the godfather of the over-the-top rock show, stopped backstage to say hi to the artist (who happens to be celebrating her birthday today, March 28th) and pose for a picture. Gaga was so excited that she didn't even bother to clean up after her show's bloody climax, and she posed for a photo with Cooper while still drenched. "I just died and went to hell," Gaga tweeted right after the picture was snapped. The two even talked about the possibility of collaborating in the future, which would end up being an eye-popping tag-team indeed.

She wasn't the only star out in the world, as Thom Yorke of Radiohead handed out newspapers in London to promote his band's new album The King of Limbs and Justin Bieber made his way through the streets of Paris on a press tour. Click here for these photos as well as the entire "Spotted" archive, which features over 500 candid shots of stars like Britney Spears, Taylor Swift, Katy Perry, Eminem, Rihanna, Jay-Z, Mariah Carey, Madonna, the Jonas Brothers, Justin Timberlake and Kanye West!