The "Notthing Hill" star was attending a birthday bash at nightspot Annabel's Wednesday night when his former representative, PR guru Matthew Freud, overheard the actor allegedly making a disparaging comment about him, reports contactmusic.
Freud reportedly retaliated by throwing chocolate cake at Grant, smearing the sweet treat all over the star's white shirt. Grant then allegedly aimed a drink in his former associate's direction, but missed.
Freud is said to have left the party, while Grant was given a clean shirt to change into by venue staff and carried on with the festivities, partying with stars including his ex-girlfriend Elizabeth Hurley and Sir Michael Caine.
