LOS ANGELES, California (X17online) - For the third weekend, The Dark Knight held on to the number one spot at the box office, earning $43.8 million to make it's domestic gross $394.9 million. The Mummy: Tomb of the Dragon Emperor snagged the number two spot with $42.5 million, while Step Brothers took in $16.3 million and claimed the number three spot.

Industry experts predict The Dark Knight will earn $400 million domestically either today or Tuesday. Jeffrey Goldstein, Warner Bros. executive vice president of distribution said, "It's a movie that has overperformed at every turn. To have a 42% drop in the third weekend is a tremendous hold. Everyone is going - everyone."