Hard to believe, but Elton John turned 70 on Saturday and he threw himself a birthday party fit for an artist that's been knighted by the Queen!
Lady Gaga, Stevie Wonder, Katy Perry, Neil Patrick Harris, Jon Hamm, Heidi Klum were among the many that showed up to ring in his big day in L.A and Stevie Wonder and Lady Gaga even jumped on stage to sing Happy Birthday!