The singer collaborated with the French music producer on her new track "Killah," which he performed with her during Friday's closing set.

Friday night's performance marked Lady Gaga's second time headlining Coachella, but in many ways it felt like her true first time.

Put your paws up, Little Monsters! Lady Gaga surprised the Coachella crowd with a special guest and an "Abracadabra" remix during her Friday (April 11) night headlining set, and the internet is still recovering from the mayhem.