After 45 years in limelight, Joan Rivers is showing no signs of slowing down, thanks to a new documentary that is already winning raves -- and awards.

According to the Hollywood Reporter, IFC Films has won a bidding war for the North American rights to Ricki Stern and Annie Sundberg's documentary 'Joan Rivers: A Piece of Work.' It premiered at the Sundance Film Festival last week and won the fest's award for U.S. Documentary Editing. As you might guess, the film takes a closer look at the private life of the famous comedienne, who recently returned to E! as the network's fearless style expert.