Adrian Grenier Vincent Chase Actor Kevin Connolly Eric Murphy Actor Kevin Dillon Johnny "Drama" Chase Actor Jerry Ferrara Turtle Actor Jeremy Piven Ari Gold Actor Debi Mazar Shauna Guest Star Constance Zimmer Dana Gordon Guest Star Andrea Bendewald Jess Guest Star Dale Dye Scuba Instructor Guest Star Dr. Joyce Brothers Herself Guest Star Jose Eber Himself Guest Star Mandy Moore Herself Guest Star Jordan Belfi Adam Davies Guest Star Rex Lee Lloyd Guest Star Sheila Jaffe Sheila Guest Star Doug Ellin Doug Guest Star, Executive Producer Chad Muska Surfer Guest Star Merritt Yohnka Cop Guest Star Marlon Young Rufus Guest Star Adrian Neil Maitre D' Guest Star Mark Wahlberg Executive Producer Stephen Levinson Executive Producer Larry Charles Executive Producer