Song Help Please? :)

Hello. I love this film and have seen it many times, but I find it very frustrating that nearly all the songs from the film are not on the soundtrack. The two I most wanted to be on there (which aren't, of course) are When The Special Girlfriend by Ute Lemper, and the rap song that plays when Helen and Jessica are getting it on after coming back from the bar. Does anyone know what the latter song is called and who it is by? Thanks! :)