Kelly Osbourne rarely posts photos of the son she shares with Sid Wilson (Picture: EPA)

Kelly Osbourne has posted a new photo of her rarely-seen son, Sidney, and the tot has grown so much.

Doting mum Kelly, 38, welcomed her first child with Slipknot star Sid Wilson last year and since then has only posted a handful of pictures of her little lad online.

But on Sunday, Kelly revealed just how much Sidney has grown when she uploaded a photo of him next to her beloved pet dog.

Kelly captioned her photo: ‘My babies,’ and Sidney looked adorable in a striped baby grow while crawling on the floor.

In March, Kelly posted the first ever photo of baby Sidney when her brother, and Sidney’s uncle, Jack came to visit for the day.

‘An uncle is a blessing. It means so many things. Words could never tell the joy an uncle brings. An uncle is a bond of faith that even time can’t sever, a gift to last all of our lives. An uncle is forever,’ she wrote alongside the photo.

Kelly captioned her photo: ‘My babies,’ and Sidney looked adorable in a striped baby grow while crawling on the floor (Picture: Instagram/kellyosbourne)

During her pregnancy with Sidney, she was diagnosed with gestational diabetes, which meant that she had to go on a sugar-free diet.

Kelly is also now on good terms with her mum Sharon, who accidentally revealed Sidney’s name earlier this year, confirming that he’d been named after his musician dad.

During her pregnancy with Sidney, she was diagnosed with gestational diabetes, which meant that she had to go on a sugar-free diet (Picture: Instagram/kellyosbourne)

The Shut Up hitmaker then issued a statement about her son’s privacy on Instagram after Sharon committed the faux pas on Piers Morgan’s TalkTV show.

Revealing that the baby’s name is Sidney, presumably after his father, Sharon said: ‘Just so great, so great. She won’t let a picture go out of him, and I’m so proud of her.’

Hours later, Kelly shared a message on Instagram that read: ‘I am not ready to share him with the world. It is no one’s place but mine to share any information on my baby.’

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Adorable.