Margot Robbie has shared an in-costume selfie as Harley Quinn, as filming on Warner Bros.'s Birds of Prey (and the Fantabulous Emancipation of one Harley Quinn) is underway.
Look closely at the dog tag Robbie is wearing - the name on it is "Bruce." The first "Bruce" to come to mind would be Bruce Wayne (a.k.a. Batman), but normally in DC continuities Harley doesn't know Batman's real identity.
In comic books, Harley has two pet hyenas, but they're named Bud and Lou.
Birds of Prey is scheduled to open in theaters February 7, 2020.