Kourtney Kardashian and BFF Addison Rae TWIN in matching outfits while enjoying sun in backyard

You know it's officially the start of summer when Kourtney Kardashian and Addison Rae begin twinning! On Friday (June 3) the 42-year-old Poosh founder invited her new BFF, TikTok star, Addison Rae for a backyard photoshoot.

The mom of three - Mason, 11, Penelope, eight, and Reign, six - matched from head, right down to toe, with the 20-year-old dancer; wearing a cropped white vest, pair of blue 'Mom' cut short, and All-Star Converse, but while Kourtney Kardashian opted for the high-top version, Addison donned the low-top converse.

For the series of pics, posted to Kourtney's Instagram, Addison and the KUWTK star lounged on the green grass while taking turns pulling faces at the camera. Kourtney captioned the post: "almost summer ?‍♀️". Take a look at the post below.

Addison Rae, following Kourtney's example, also posted a series of pics from the impromptu photoshoot to her own Instagram page. In these pics, Addison and Kourtney Kardashian sat facing the camera, while still sitting on the grass hill. In the first pic, Addison gazed lovingly at Kourtney while she smouldered, and in the next, Addison rested her head on the Poosh founder's shoulder. Take a look below.