Before Lady Gaga was Lady Gaga, she was a teenage extra on seminal mobster show The Sopranos. Yes, on episode nine of the third season (“The Telltale Moozadell!”), Stefani Joanne Germanotta makes a fleeting appearance as a teen at a party. The 15 year old future superstar is only on screen for a few fleeting moments, and she has no lines, but it most certainly is her.
So there’s that.
Still and more information can be found here.