Domain mapping

I own http://www.jbertz.com and purchased it through google apps. I have blog.jbertz.com redirecting to my wordpress.com account. I just had a friend of mine give me permission to upload my blog to his hosting account on godaddy.com.

So I own my own domain and have it hosted on another domain. Is it possible to have the domain I own through google redirect to the wordpress account I have setup on godaddy?