请问这首英文歌叫什么？谁唱的？

pussycats dolls Buttons
http://mp3.baidu.com/m?f=ms&tn=baidump3&ct=134217728&lf=&rn=&word=Buttons&lm=-1
i'm telling you loosen up my buttons baby (uh huh)
but you keep fronting (uh)
saying what you going to do to me (uh huh)
but i ain't seen nothing (uh)

i'm telling you loosen up my buttons baby (uh huh)
but you keep fronting (uh)
saying what you going to do to me (uh huh)
but i ain't seen nothing (uh)

typical
hardly the type i fall for
i'm liking the physical
don't leave me asking for more
i'm a sexy mama (mama)
who knows just how to get what i want and (want and)
what i want to do is spring this on you (on you)
back up all of the things that i told you (told you)

you been saying all the right things all along
b