Ridley Scott’s upcoming true crime drama about the assassination of Maurizio Gucci, the onetime head of the Gucci fashion brand who was gunned down by a hitman hired by his ex-wife Patrizia Reggiani, already had some major star power attached with Lady Gaga on board to portray Reggiani. But the film’s cast might become even more impressive, with reports that Robert De Niro, Al Pacino, Adam Driver, and Jared Leto are all in talks for roles in the project. [caption id="attachment_743560" align="alignright" width="360"] Image via Warner Bros.[/caption] As reported by Deadline, De Niro, …