Lady Gaga, Stevie Wonder & more perform at Elton John's 70th birthday - VIDEO

Lady Gaga, Stevie Wonder & more perform at Elton John's 70th birthday - VIDEO

British popstar Elton John turned 70 and celebrated with a lot of friends with a party which took place in Los Angeles, on March 25. Elton invited stars including Lady Gaga, Stevie Wonder, Ryan Adams and Rosanne Cash to perform.

Lady Gaga and Wonder partnered on a "Happy Birthday" duet in honor of John, and Gaga also performed "Born This Way" and "Bad Romance" on piano. Adams paid tribute to John with a cover of "Rocket Man",

Katy Perry, Jon Hamm, James Corden and Neil Patrick Harris were among the other guests spotted at the bash, while famous pals who couldn't be there in person - Bono, Prince Harry, Ellen DeGeneres and David Beckham - recorded videos wishing John a happy birthday. Rob Lowe hosted the event, which benefited the Elton John AIDS Foundation and UCLA's Hammer Museum.