According to FemaleFirst, Federline has been working hard to create his rap career, and did not want his celebrity wife to overshadow his moment in the lights.
Witnesses say that before the performance they heard the Princess of Pop fighting in a restaurant with her husband, and she ran off to her hotel room. She did not attend the launch party later that evening.
A source close to the scene said, "Kevin didn’t want Britney overshadowing him on the red carpet. Britney fled the restaurant and raced up to her suite alone, boycotting his performance."