The 40-second TV ads will air for the first time on Sunday (1 November).
The campaign includes terrestrial and satellite television ads, as well as national press and online ads.
The very.co.uk ad features Holly Willoughby and Fearne Cotton who have designed an exclusive range of women’s wear for the retailers.
The Littlewoods ad uses shop staff and features branded and own-label products.
It will use the tagline “Christmas in manageable bits” to promote the fact that customers can pay for purchases in instalments.
The ad will receive 104 hours of airtime and Shop Direct estimates that 91% of the population will see it.
Mark Newton-Jones, chief executive of Shop Direct says: “Christmas has always been a really important part of our trading calendar and these campaigns will help reinforce our growing brand.”