In the ad, she steals a packet of Sunbite crisps from a neighbour then makes her escape by helicopter.
She told the Daily Mail: "This has been a brilliant home-coming. I was really nervous when I arrived because it’s my first TV advert, but it’s so exciting to be filming in my own home town!"
Rebecca isn't the first of last year's X Factor contestants to appear in an advert — earlier in the year, One Direction starred in an ad for the new Pokemon DS game.
How about some music at some point though? Right? Right.