Joan Rivers: A Piece of Work continues its impressive summer run at the box office, showing a gross cume of $2,000,548 since its June 11 debut. The Ricki Stern/Annie Sunberg helmer is the fourth doc to cross the $1 million mark this year, following Jacques Perrin and Jacques Cluzaud's Oceans, Thomas Balmes' Babies and Bansky's Exit through the Gift Shop, according to BoxOfficeMojo.com.

Here's a roundup of the top ten grossing docs at the box office for 2010:

1) Oceans                                                                      $19,406,406

2) Babies                                                                        $ 7,320,323

3) Exit through the Gift Shop                                          $ 2,890,215

4) Joan Rivers: A Piece of Work                                      $ 2,000,548

5) The Most Dangerous Man in America:
Daniel Ellsberg and the Pentagon Papers                          $  453,336

6) Restrepo                                                                    $ 265,462

7) Casino Jack and the United States of Money                $ 176,865

8) South of the Border                                                     $ 103,000

9) 8: The Mormon Proposition                                           $  92,130

10) Stonewall Uprising                                                       $  84,964