Sofia Richie, 20, wishes her 'best friend' and beau Scott Disick a happy 36th birthday

Sofia Richie, 20, wished her boyfriend Scott Disick a happy 36th birthday on her Insta Stories this Sunday.

The daughter of Lionel Richie posted a sweet photo of herself sitting on a deck chair as her man lay back sprawling across her lap.

'Happy birthday to my best friend,' wrote Sofia, including a cartoon of a skeleton playing the saxophone with the snap of her much older paramour.

'My best friend': Sofia Richie, 20, wished her boyfriend Scott Disick a happy 36th birthday this Sunday on her Insta Stories

'My best friend': Sofia Richie, 20, wished her boyfriend Scott Disick a happy 36th birthday this Sunday on her Insta Stories

Scott shares three children with his on and off ex Kourtney Kardashian - Mason, eight, Penelope, six, and Reign, four.

Although he did not get a birthday Instagram post from his used-to-be, he did receive warm wishes from her mother Kris Jenner.

Over a collage of photos of him with Kourtney, Kris and the little tykes, the momager wrote: 'Happy birthday Scott!!'

So sweet: Kris Jenner, whose daughter Kourtney Kardashian shares three children with the birthday boy, posted a heartwarming tribute to Scott

So sweet: Kris Jenner, whose daughter Kourtney Kardashian shares three children with the birthday boy, posted a heartwarming tribute to Scott

The twice-divorced reality TV matriarch added: '@letthelordbewithyou you are the most incredible father to Mason, Penelope and Reign, and I thank God every day that you are a part of our family. I love you so much!'

Kris has lately been enjoying the sights of Monaco with her much younger boyfriend Corey Gamble and her daughter Kendall Jenner.

Sofia, who happens to be the younger half-sister of reality star turned sitcom actress Nicole Richie, was absent from Kris' Instagram collage about Scott.

Fab: Kim Kardashian, the aunt of Scott's children, also posted a couple of throwback snaps of Scott with her half-sister Kylie Jenner

Fab: Kim Kardashian, the aunt of Scott's children, also posted a couple of throwback snaps of Scott with her half-sister Kylie Jenner

Kourtney's younger sister Kim Kardashian also posted a couple of throwback snaps of Scott with her half-sibling Kylie Jenner.

'Found these gems from 2008. Scott I’ve known you for almost 15 years, we’ve all been through so much together and have the best memories!' Kim wrote.

'You are like my brother. I’ve seen you grow up and become the most amazing father and friend. So happy you are in our lives. I love you Happy Birthday'.

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Sofia Richie, 20, wishes her 'best friend' and beau Scott Disick a happy 36th birthday