And on Sunday, the X Factor judge was pictured taking some steps while out in Malibu with his son Eric and partner Lauren Silverman.
Simon looked in good spirits as he walked around with his family during a shopping trip, in photos published by The Sun.
VIDEO: Simon Cowell celebrates his birthday with son Eric
The doting dad was seen carrying a shopping bag while holding onto his son's hand, dressed in a grey T-shirt and white shorts, with a protective face mask.
Simon has been resting at his home in Malibu since his accident, and has been receiving round-the-clock care.
Simon Cowell is making a speedy recovery following his bike accident
The America's Got Talent judge has kept a low profile since his accident but his famous friends have been updating fans on his progress.
Most recently, Amanda Holden opened up about the star's recovery during an appearance on Loose Women.
The Heart Radio presenter revealed that she was hopeful that he would be back on TV again in the not so distant future.
"I miss Simon like crazy, I think Ashely [Banjo] is doing a brilliant job but there's a lack of silliness, let's say," she said.
The music mogul celebrated his birthday with son Eric earlier in October
The mother-of-two also told the panel that she had sent Simon a recovery gift to remind him of the UK when he first broke his back.
"When he had the accident I sent him socks, Angel Delight, a book and Lego," she said.
The X Factor star is putting on a brave face
Simon was also captured on camera last weekend as he celebrated his birthday with his family and Terri Seymour, in footage shared on her Instagram page.
When news emerged that Simon had broken his back, the dad-of-one reassured his fans that he was doing okay.
Simon's family are looking after him at home in Malibu
"Some good advice… if you buy an electric trail bike, read the manual before you ride it for the first time," he tweeted.
"I have broken part of my back. Thank you to everyone for your kind messages."
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