Khloe Kardashian has revealed that her son Tatum has a strong bond with his cousin Saint West.

The 40-year-old Good American founder took to Instagram and shared a sweet photo of her two-year-old boy with his arms wrapped around sister Kim Kardashian's eight-year-old son and opened up their relationship.

She said on Instagram: "I was going through my camera roll and I came across this photo of Saint and Tatum. Saint is the absolute sweetest when it comes to babies, but his connection to Tatum is one that can’t be explained.

"They were destined to be in one another’s lives! Proud auntie! Proud mommy!" (sic)

Kim - who had Saint with rapper ex Kanye West - commented on the post: "Sainty loves Tatum so much! We all do!"

Khloe - who has Tatum and daughter True, six, with her ex Tristan Thompson - also shared last week that she is having a hard time "processing" the fact her little girl has started first grade.

The reality star admitted she was experiencing a "strange mixture of loss, anxiety and fear".

She posted to Snapchat: “It’s always such a rollercoaster of emotions when True starts a new school year. This year is a big milestone for her… first grade.

“I’m not going to lie, I am having a really hard time processing the fact that she’s going into first grade.”

She continued: “There’s this undeniable feeling that I’m losing parts of who she was with each day that passes.

“The little parts of who she used to be are being replaced with new parts that will make up the next little amazing person she will become. And I miss her. All the little versions of her who I used to know. Time moves fast, faster every year it feels like, and this new school year is a reminder to me to fully embrace every moment and soak it all in.”