Paid for wordpress.com domain, want to move to .org

Hi guys,

I’ve paid ￡15 for a years hosting on wordpress.com, but I’m thinking I want to move to www.remarpro.com for the plugins and themes. Will I need to pay for a new domain host, or should I be able to use the existing one that I’ve already paid for? It seems like a waste of money if I have to pay for another host monthly when I already have this one for a year.

Cheers