'American Idol' fight night: Ellen DeGeneres calls Simon Cowell 'a prima donna'

It definitely wasn't all fun and games for  Ellen DeGeneres on her first day on the "American Idol" set.

The comedian-talk show host was on time and jazzed about her new judging duties. But according to Nikki Finke's Deadline blog, veteran judge  Simon Cowell was an hour and a half late, leaving Ellen to sit and wait. And wait. And wait. And we all know how much fun that is.

Not nice, Simon. Ellen had gone to the trouble to shoot her talk show earlier in the day and then she raced to "Idol."