Julia Fox's choice of Halloween costume might have been embraced by her fans ... but it looks like Jack Schlossberg wasn't one of them.

EXCLUSIVE: Julia Fox (Uncut Gems) has boarded Radio Silence’s feature adaptation of Loser, the award-winning short from Colleen McGuinness, as both a cast member and an executive producer. Details as to the role she’s playing are under wraps.

Julia Fox reveals she wants to have another baby but questions this key component. The actress is already mom to son Valentino, 4, whom she shares with ex Peter Artemiev.