Lady Gaga asked the crew to call her "Lee" on set
Joker cinematographer Lawrence Sher says Lady Gaga wanted to be called “Lee” (for Harley) on set:
“I didn’t know Stefani at all… And for a week, I feel like we weren’t connecting. And then the AD at one point said, ‘Stef would like if you just called her Lee on set’ […] And our whole connection changed.”