In 2011, Sting held a concert in New York to celebrate his 60th birthday. The famed rockstar invited many of his famous friends on stage, including Bruce Springsteen, Billy Joel and Lady Gaga. But you may be surprised as to who really stole the show — Robert Downey Jr., who joined Sting on stage for a now viral duet. Not only is he a handsome, charming and talented actor, but who knew Robert Downey Jr. is also an incredible singer?! Seriously, is there anything he can’t do?