Joaquin Phoenix and Lady Gaga star as Arthur Fleck and Harley Quinn, respectively, in Todd Phillips' sequel to "Joker." Here's what to expect.

The actor, who stars as the Batman super-villain in the upcoming Joker ... The clip shows Phoenix in character while shooting the film, complete with clown makeup and tangled long hair.

A viral outtake from the set of "Joker," which was presented on "Jimmy Kimmel Live" last week, showed Phoenix in his character's makeup yelling at someone named "Larry" to "shut up" with the ...

The dancing stopped for Joker (Joaquin Phoenix) and Harley Quinn (Lady Gaga ... He even maniacally defends himself in full Joker makeup and attire in his Gotham City "trial of the century ...