The 34-year-old welcomed her first child only seven months ago, but it didn't take her long to get back into shape.
The new mum shocked fans when she made her first appearance since becoming a mum at the charity football match Game4Grenfell in August, showing her petite figure and her toned stomach five months after giving birth.
But how has she done it? Ahead of her big X-Factor comeback, Cheryl has revealed the secret behind her incredible post-baby weight loss, and it's actually very relatable.
Rather than going to a fancy gym or having a personal trainer, the new mum has been working out at home using workout videos.
But, being Cheryl, she doesn't rely on YouTube clips. Bear's mum uses a streaming service from Tracy Anderson, an American personal trainer whose clients include the likes of Gwyneth Paltrow, Nicole Richie and Shakira.
Cheryl surprised fans with her incredible post-baby body in August
She told Vogue magazine: 'Tracy Anderson has a streaming service and it's heaven sent. I have a space in my house where I heat up the room and then just stream it and follow that.
'I've always done Tracy Anderson. When I lived in the States, I went to Brentwood, to her studio, but the streaming is brilliant, so easy and you can do it in your living room.'
Cheryl attended the charity game with Nicola Roberts
The service, which allows users to stream live classes and to also access a library of dance cardio sessions, costs $475 for six months, which is around £360 - and equivalent to around £60 per month.
The mum-of-one, who's been very private about her pregnancy and motherhood, also opened up about how she spends her free time with boyfriend Liam Payne and their son Bear, saying sleep is her main form of relaxation at the moment.
'Nowadays my main way to relax is sleep. Since the baby was about seven weeks old he's slept seven hours through and now he can sleep for 12, so I'm lucky. But the first time I had a massage, since the baby, I think I went to a dreamland.' she said.
'It's just me, Liam and the baby rocking around 24/7, so you don't have one second to yourself really, especially not in that first three months. They're so precious. So when someone said "go for an hour", I was like, "hallelujah!" I think that should be a gift to any new mother.'