Reese Witherspoon's children Ava, 22, and Deacon, 18, model Beyonce's new Adidas collection: 'Welcome to the Halls of Ivy Park'

Reese Witherspoon and Ryan Phillippe's mini-me's, Ava and Deacon Phillippe, have been enlisted as models for Beyonce's new Adidas collection, Halls of Ivy Park.

After making their joint modeling debut in the singer's star-studded advert for her newest Ivy Park drop this week, the celebrity offspring were officially welcomed into the brand via Instagram.

Ivy Park released six portraits of Ava, 22, and Deacon, 18, with the caption, 'Welcome @AvaPhillippe and @DeaconPhillippe to the Halls Of Ivy.'

In the first snap, the good-looking brother and sister duo are serious-faced as they pose for the camera while sporting new pieces from the Ivy Park line in various shades of green.

Ava wears a dark green and black sports bra and leggings, with a houndstooth pattern, along with a dark green fleece jacket. She also has on a trucker hat and chunky green boots.

Meanwhile her brother models a lime green hoodie with matching socks and shoes. The look is completed with a warm jacket and shorts. His hair is stylishly slicked back with gel.

In the other photos the siblings are separated and Deacon is seen jumping up in the air while wearing the same outfit. Ava is also caught mid-jump with her blonde hair flowing in the wind.

Ivy Park fans were elated at the choice of the siblings, commenting on the photos: 'Seeing Elle Woods' kids in the Halls of Ivy is the serotonin boost I didn't know I needed.' 

Many were also quick to point out the astonishing resemblance of the two to their famous parents, Reese and Ryan. 'Looking just like their mom and dad,' one fan wrote, while another added, 'Copy and paste of Reese and Ryan.'

The duo starred in Beyonce's latest advert for her collection earlier this week, where they are seen playing ping-pong.

In the video Ava sported a cute black and white skirt, headband, and zip-up crop top, meanwhile Deacon wore a comfortable gray tracksuit and black boots. 

The campaign also features Natalia Bryant, the eldest daughter of the late basketball legend Kobe Bryant, as well as Beyonce's own children, Blue Ivy, nine, and Rumi, four. 

Halls Of Ivy will be released exclusively on Adidas' website for 24 hours on December 9, before it will be made available globally on December 10.