On November 5, Mark-Paul Gosselaar, Julie White, and Justin Kirk officially opened in the Roundabout Theatre Company's Off-Broadway production of Theresa Rebeck's The Understudy at the Laura Pels Theatre.

Tony Award winner David Hyde Pierce, who will perform with Michael Feinstein at Feinstein's at the Loews Regency during December, attended the opening of Theresa Rebeck's The Understudy at the Laura Pels Theatre on November 5.

Victor Garber, who will return to Broadway in January in the Roundabout Theatre Company's revival of Noel Coward's Present Laughter, attended the opening of Theresa Rebeck's The Understudy at the Laura Pels Theatre on November 5.

Hunter Parrish came out to support his Weeds co-star Justin Kirk, who co-stars in Theresa Rebeck's The Understudy, which opened at the Laura Pels Theatre on November 5.

Former Speech and Debate star Jason Fuchs and Jason Moore, director of Shrek the Musical and Avenue Q, attended the opening of Theresa Rebeck's The Understudy at the Laura Pels Theatre on November 5.

Katie Finneran, one of the rotating stars of the Off-Broadway hit Love, Loss, and What I Wore, attended the opening of Theresa Rebeck's The Understudy at the Laura Pels Theatre on November 5.

Dominic Fumusa, who stars on the hit Showtime series Nurse Jackie, attended the opening of Theresa Rebeck's The Understudy at the Laura Pels Theatre on November 5.

Tony Award winner Susan Stroman attended the opening of Theresa Rebeck's The Understudy at the Laura Pels Theatre on November 5.

On November 4, Richard Foreman's Idiot Savant officially opened at the Public Theater. Here's the show's star, Willem Dafoe, who joined the cast for a post-show celebration at Forum.

Jonathan Groff, who is set to join the cast of FOX's hit series Glee next year, attending the November 4 opening of Idiot Savant at the Public Theater.

On November 3, Lynn Redgrave was joined by her sister, Vanessa Redgrave, at the opening of her acclaimed solo show Nightingale at Manhattan Theatre Club.

Ashley Morris and Charles Busch, who co-starred in the Off-Broadway production of Die Mommie Die!, attended the opening of Lynn Redgrave's acclaimed solo show Nightingale at Manhattan Theatre Club on November 3.

Gossip Girl star Margaret Colin, whose new film The Missing Person opens later this month, attended the opening of Lynn Redgrave's acclaimed solo show Nightingale at Manhattan Theatre Club on November 3.

Broadway star Penny Fuller, who will entertain at Primary Stages' upcoming gala on November 9, attended the opening of Lynn Redgrave's acclaimed solo show Nightingale at Manhattan Theatre Club on November 3.

Jill Eikenberry and husband Michael Tucker attended the opening of Lynn Redgrave's acclaimed solo show Nightingale at Manhattan Theatre Club on November 3.