Okay here's more on Nas:
www.mtv.com/news/articles/1529698/ 04272006/aguilera_christina.jhtml?headlines=true
<Sure, Christina Aguilera got married, collaborated with old hands Herbie Hancock and Andrea Bocelli and made an album she's called "retro," but the former Xtina still has a dirty side.
In fact, she's got a track on that new record with Nas called "Still Dirrty."
"It's part two of the one she did on the last album, but the beat is totally different," said DJ Premier, who produced several of the songs. "It's more jazz-sampled with these horn blasts.">
It also says Nas is the only guest.