Leonardo DiCaprio takes singing lessons to play Frank Sinatra

Insiders revealed director chum MARTIN SCORSESE has put DiCaprio at the top of his list to play Sinatra.

But Scorsese is insisting the actor does it HIS way — by mastering the Rat Pack legend’s famous tones.

A source confirmed: “Leo has hired a top vocal coach to get him sounding like Sinatra. He is a massive fan of the singer and has always wanted to play him. He would be sick to miss out on the leading role because his singing wasn’t up to scratch.