Williams -- who won the Academy Award for "Music by Prudence" -- was interrupted mid-acceptance by producer Elinor Burkett.
Burkett and Williams had been feuding over creative control of the project, and they struck an out-of-court settlement. Burkett had been removed from the movie, but still kept her producer credit.
Here's the best part: Burkett tells Salon.com, when she stood up to go onstage, Williams' mom tried to block her with a cane.
UPDATE: Burkett will tell her side of the story to Joy Behar on her show on HLN at 9:00 PM on Tuesday night.