PICTURE EXCLUSIVE: Pecking order! Ashley Graham takes the rear as Kendall Jenner and Gigi Hadid lead model line up for swimsuit shoot

Kendall Jenner and Gigi Hadid's friendship has become the stuff of legend among the iGeneration. 

But the gorgeous BFFs welcomed a new addition to their girl squad on Monday as they shot a new swimsuit spread in Malibu with none other than body-con guru Ashley Graham.

The in-demand models slipped into beach wear as they posed for various lighthearted snaps in the balmy California weather just days away from Christmas. 

Fall in line! Kendall Jenner and Gigi Hadid's friendship has become the stuff of legend among the iGeneration but on Monday the duo welcomed Ashley Graham to their squad as they shot a swimsuit shoot in Malibu

Gigi was spotted engaging in some horseplay with her best friend during a break in the shoot.

The 21-year-old gave her fellow 21-year-old a piggy back ride as they both sported semi-sheer black tops.

Kendall wrapped her legs around Gigi's waist as she sported floral patterned pink swimsuit bottoms.

 Ride em! Gigi was spotted engaging in some horseplay with her best friend during a break in the shoot

Ho ho ho! The in-demand models slipped into beach wear as they posed for various lighthearted snaps in the balmy California weather just days away from Christmas.

Good pound! Ashley seemed enthralled as Kendall got to work with a sledgehammer for the shoot

 Sliding away! The models made their way to the shore in skimpy attire

Fly little birds! The group of models flapped their arms for a playful series of photos

Gigi had her own pair of patterned bottoms that exposed some of her derriere and thighs.

The duo slicked their hair back into tight buns, showing off their youthful faces.

Later the two girls lined up with Ashley Graham for a group shot.

Wee! The star frolicked on the beach in her revealing getup

Besties: The duo showed off their incredible figure in the skimpy wear

You're not flapping! The ladies were a bit out of sync

Sandy fun! Ashley could not contain her glee during the beach shoot

The six models flapped their arms like birds with plus-size Ashley taking the rear, while unable to hold back her smile.

The 28-year-old sported a black turtleneck, matching Gigi and Kendall, with a pair of black booty shorts.

Ashley seemed tickled as she watched the younger models get their hands dirty playing in the sand like children.

Just booty-ful: Kendall looked stunning as ever in her getup

Easily distracted: The models seemed to have their attention drawn away from the task at hand

Reindeer games: Some of the young models couldn't help but play in the sand

Quite the production! Gigi and Kendall were surrounded by a large crew in the idyllic setting

Making her laugh! Kendall got the giggles while chatting with Gigi

Centre of attention: The reality star seemed in her element surrounded by the glam squad

While she's known best for breaking the size 0 stereotype, she recently revealed that she resents the term 'plus-sized.

Ashley told Vogue: 'When we’re supposed to be talking about diversity for women, it feels so divisive and purpose-defeating, giving us yet another label.'

The striking star, who famously became Sports Illustrated's first-ever curvy cover girl in the spring, also opened up about her weight to the publication.

'Do I sometimes wish I were thinner? God, in the old days, absolutely I did, but now I feel that to lose weight would be disloyal to myself.

'A lot of who I am is connected to my size, and I am so happy with who I am.'

Take me by the hand: Gigi led her pal down the beach, proving their friendship might be the sweetest thing in the modelling world

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