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From Elle Magazine:

The green carpet was not without drama of its own. Taking advantage of being one of the last people to come into the ceremony, Sean "Diddy" Combs took his time, having the press line almost all to himself. And just as his Diddy-ness was pausing to make a grand walk up the stairs for the paparazzi, his former publicist Rob Shuter pushed Jessica Simpson up the stairs ahead of Combs, stealing his thunder. "Rob, don't do that," the rap impresario called. After literally being called on the carpet, there was a happy endingóSimpson and Combs posed together for the press.

Via PR inside via Page Six.