Joan Rivers: A Piece of WorkBetty White may have the Internet buzzing, but at age 76, Joan Rivers is still going strong, as evident in her new documentary, 'Joan Rivers: A Piece of Work.'

The doc, which premiered at the Tribeca Film Festival, offers an up close and personal look at 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.' At times funny and heartbreaking, the film explores what, as Rivers herself described, "what a career really is about."

In an exclusive interview with Moviefone, Rivers dished more on the film (which won a Best Editing prize at this year's Sundance Film Festival), the City of New York and what she thinks about the Betty White phenomenon.