The 35-year-old reality star shared a gorgeous new picture of the six-month-old baby on her social media accounts, showing Saint wearing an all-white outfit and chomping on his fingers.

She captioned the shot, "On my Snapchat", but then responded to several fans who commented on the fact that he looks so much like his famous mother.

"Saint is my twin!" she wrote.

One fan said the likeness was mainly in the eyes, with Kim replying: "Yeah we have the same eyes. def (definitely) a good mix of both of us but he is more me, I think..."

Kim and husband Kanye West are also parents to three-year-old daughter North, but the Keeping Up With the Kardashians star said her little girl looks more like her husband.

"I mean North's baby pics look like mine too but Saint i think looks more like me and North like Kanye," she added.

Kim and Kanye have remained relatively quiet in terms of sharing pictures of Saint on social media following his birth in December (15).

But Kim has been open about how her life has changed since becoming a mother of two, admitting in a recent episode of her E! show that she agrees with her mother Kris Jenner's remark that "one (child) is one, but two is 20".

However, when a fan on Twitter asked if parenthood was everything she thought it would be during a conversation on the site earlier this month (Jun16), Kim replied: "Beyond what I imagined in the best way possible."

North is also helping out with her little brother, as Kanye revealed during an interview on The Ellen DeGeneres Show earlier this month.

Revealing she's "really advanced for her age", Kanye added: "She likes to help prop him up on a pillow."