Growing up in Greater Manchester, Mirallegro attended the Manchester School of Acting as a teenager, and came to public attention after being chosen at age sixteen for his role in Hollyoaks. "Looking back on his teenage years, he describes himself as 'quite rebellious'. 'I was quite naughty with my mum. We just used to argue and I'd run out of the house and leave home. That was partly why I went to live with my dad in Spain in my early teens. I was a very active child, so when I was bored, I'd let her know.'"