Leaked photos from the set show Joker tossing Harley’s belongings out of a window , but Leto is not returning in Birds of Prey. So, this cameo is probably just as long as the Joker's cameo in the first Birds of Prey comic was. That’s good for fans who want to see Harley have the “fresh start” she raves about after tossing knives at a drawing of the Joker in the trailer.