The film, which is shooting in New Orleans, follows wealthy opportunists who profited off the American economic meltdown in the mid-2000s, reported Entertainment Weekly.
Gomez, 22, is apparently playing a Manhattan professional. It appears she will appear in a cameo as her participation in the shoot, which took place at Harrah's Casino in the French Quarter, was for only a day.
In 2013, the singer-actress admitted to Ellen DeGeneres that she was starstruck when she first met Brad Pitt after he came to meet her after a concert.