Sigler is best known for playing Meadow, the daughter of New Jersey mob boss Tony Soprano, on the recently wrapped TV drama "The Sopranos."
"'Entourage' is one of my favorite shows and I'm thrilled," Sigler said in an e-mail message to E! Online. "I'm playing myself which can be weird, so I hope I don't PLAY myself!"
The report said the actress has already begun shooting her role.