According to the Entertainment Weekly, Eminem has already filmed some scenes in which he'll appear, and apparently he doesn't sing in any of them.
The scenes in which he appears will be filmed at the party after receiving the platinum record for sales of the album Recovery (they predicted that when the episode will be released the album will exceed the record sales), and Eminem will have a small issue with Vince.
Aguilera will play the role of a client of Ari's and will sing in the episode. She will do a favor to Arizona, will play for him at a party.
In this episode will appear as guest stars John Cleese and Mink Kelly alongside Drew Brees, Ryan Howard, Kevin Love and Jordan Farmar.
The finale of the 7th season will be broadcast on September 12.