"As part of the campaign, her face is going to appear on 50 million packets of crisps.
"Walkers are hoping to tie in Mariah's involvement with their big advertising campaign during the festive season, which they think could work really well with her hit All I Want For Christmas."
In May, the Spice Girls - minus band member Victoria, who opted out of their reunion tour this year - landed a campaign with the crisp brand 22 years after their last TV ad for the company.
The Viva Forever hitmakers appeared on screens across the nation promoting the savoury treats for the first time since 1997, when they had their faces printed on the sought-after packets.
Retired soccer star Gary Lineker has been the longest-running face of Walkers, having signed a deal worth $380,000 in 1994.
Earlier this year, he was joined by Inbetweeners actress Emily Atack in an advert.
-Bang! Showbiz