The hilarious Betty White was making an appearance on James Corden’s, The Late Late Show and, ever the joker, decided to prank-call the host before her arrival.

A bewildered James Corden politely obliges the comedy legend as she makes some outrageous diva-esque requests.

Oh yes – ranging from demanding a change in dressing room colour to supplying just one flavour of M&Ms (yellow), the 93-year-old sure knows how to act the prima donna.

With his comedy background it’s a wonder the 36-year-old Londoner didn’t realise that it was a prank sooner. Although, with some celebrities' reputations, he can probably never be too sure.

Watch the hilarious clip where a secret camera captures James’ flabbergasted reaction.