One, two, three, four we declare a bum war.

Yep, Geordie Shore lasses Holly Hagan and her BFF lass Charlotte Crosby will be battling out in the booty market this Christmas with the release of Holly's latest bookHolly Hagan's Booty Camp.

Char of course is aiming to repeat the huge success of her 3 Minute Belly Blitz with herfollow-up DVD - 3 Minute Bum Blitz.

And Holly is actually releasing not onebut FOURrecipe and fitnessbooks, with her othersincluding Tighter Tummy In 20 (try saying that fast!), 25 Guilt Free Desserts and 25 Seriously Low Carb Meals.

Holly's books will share the secret of her incredible four-stone weight loss with her fans - with a promise of "pert, round buns of steel" for those who put in the hard yards.

The new books follow Holly's previous success with her Body Bible and Lose 5 Pounds In 1 Week.

So which Geordie lass's offering should you buy? Both of course!

'The season finale of Geordie Shore in Greece is on MTV next Tuesday at 10pm.'