How Lady Gaga Helped Joaquin Phoenix With His 'Joker: Folie à Duex' Singing (Exclusive)

How Lady Gaga Helped Joaquin Phoenix With His 'Joker: Folie à Duex' Singing (Exclusive)


Lady Gaga chats with ET’s Denny Directo at the premiere for ‘Joker: Folie à Duex,’ in theaters on Oct. 4.

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