Singer of German band Tokio Hotel <3. born september 1st 1989 and is a twin with his brother tom kaulitz (who is 10 minutes older than bill). Dispite that fact that bill is younger, he still is the boss of tom. no matter what :D
I say you shuld check out Tokio Hotel, their music is great, lyrics and all.
boy: whos that chick on your wall? SHES HOT!
girl: its a guy,, his name is bill kaulitz and hes oh so sexy :D
boy: ohh i can see that now. i think he just ruined my hetrosexuality!