Now, Gaga's "American Horror Story: Hotel" director Ryan Murphy is spilling details on how the three superstars met.
"One day John Travolta said 'I want to meet Lady Gaga,' and I said OK. So I bring him over to her," Murphy told E! News. "And she's naked covered in blood. Doing a sex scene. And it was like, 'Oh, maybe it's not the right day for this.' And he was standing behind the monitor like cheering her on, and she was like, so thrilled the first time meeting John Travolta. So I ushered them off into a room."