Lady Gaga stuns in a custom-made gown as she joins co-star Joaquin Phoenix and supportive fiancé Michael Polansky at the UK premiere of Joker: Folie à Deux - after its triumphant opening in Venice
Lady Gaga shows off huge 8 carat engagement ring as she hits the red carpet with fiancé Michael Polansky at Joker: Folie à Deux premiere during Venice Film Festival
