Can Drea de Matteo be at two places at once?

Q Since Drea de Matteo has signed on to play Joey’s single-mom hairdresser sis on NBC’s Friends spin-off, Joey, what’s going to happen to her Sopranos Mob mole Adriana?

A An HBO rep says that de Matteo has a commitment for the sixth and final season of The Sopranos, and insists her contract won’t interfere with the NBC deal — Sopranos regulars are free to book new series now that season 5 has wrapped. But as Tony would point out, a contract’s just a contract and (spoiler alert!) a key Sopranos source says Adriana will exit if Joey takes off. But how? Witness Protection? Or will Christopher stab her in the back?