It's not just you - Christmas season really is starting early this year, thanks in part to Mariah Carey saying so.

Never mind that the royalty cheques from 'All I Want For Christmas' usually don't clear until the middle of the summer, but now Mariah Carey's also doing an ad for Walkers Crisps featuring - you guessed it - 'All I Want For Christmas'.

The big takeaway from the ad, however, is how she eats them. Really, that should have been the focus of the ad - not the fact she can split glasses with her voice, although that's funny too. Also, the idea of Mariah Carey giving people a painting of herself on a unicorn is just perfect.

Take a look.