Which rapper features on the 2006 song “Smack That” by Akon?

"Smack That" is a song by American singer and songwriter Akon featuring American rapper Eminem from the former's second studio album Konvicted (2006). Produced by the latter, it was written by the artists alongside Mike Strange and Luis Resto. The collaboration came after the two artists met during a recording session for Shady Records rapper Obie Trice. The song received acclaim from contemporary music critics for being a great club song.