The singer got into The Brit School in Croydon, London, and said that it motivated her to concentrate on her career.
She told the News of the World: 'I hate to think where I'd have ended up if I hadn't gone to The Brit School.
'It's quite inspiring to be around 700 kids who want to be something - rather than 700 kids who just wanna get pregnant so they get their own flat [apartment].
'My first school was great but I'd have a kid by now if I hadn't left. And, as much as I'd like to have a kid, I'm not ready for one now. I remember wanting to go to [the] Sylvia Young Theatre School because Baby Spice [Emma Bunton] went there but my mum couldn't afford it.
'I didn't have some rich daddy who built me a studio. But I loved The Brit School. It was a bit like Fame sometimes - you get people doing their ballet stretches and singers having sing-offs.'