As most know by now, T-Pain filled in as a last minute replacement for comedian Katt Williams, who was supposed to host BET's 2008 Hip-Hop Awards in Atlanta, Georgia over the weekend. However, no one knows why.

Rumors sprung up on the net, that the popular comedian was picked up by authorities for an undisclosed reason. Then, there was a story that leaked that claimed that Williams lost a break-dancing contest to the auto-tune singer, and in turn, gave Pain the job. However, New York's Daily News is citing another reason -- his ego.

According to the paper, Katt was involved in an argument with BET executives prior to the show's tapping, and bailed on his commitment, leaving Pain to fill in.

A source told the paper, the comedian has become "difficult" to deal with now that he's gained popularity.

"He was very demanding during rehearsals," the source told the Daily News. "He really berated one female member of the production company. He launched into a verbal assault on her in front of other people. I mean, he read her the riot act.

"Then he left the set and said he wouldn't return unless she apologized. She wouldn't. BET and the production company backed her up. Katt wouldn't come back. Nobody was willing to budge," the unnamed source continued.

With Katt not on board the night before, BET had no choice, and were left scrambling for a replacement. So, T-Pain was called last minute, and agreed.

The aforementioned breaking-dancing story was agreed upon by BET's executive, Stephen Hill, in interest of working with Williams in the future, according to the Daily News' report.

BET had declined to comment at press time.