Joan RiversBetty Who?

Legendary comedienne Joan Rivers is back and better than ever in the new documentary 'Joan Rivers: A Piece of Work,' which opens in select theaters Friday.

The award-winning doc follows the highs and lows of Rivers' long-standing career in Hollywood, including her fallout with Johnny Carson and NBC, the suicide of her husband, Edgar Rosenberg, and her successful, albeit controversial, victory on 'The Celebrity Apprentice.'

Rivers -- who turned 77 this week -- recently chatted with Moviefone about the pressures of Hollywood, Betty White, advice for Conan O'Brien and her secret to surviving in the business.