Jay-Z, Kanye West, Cee Lo, Justin Bieber, Christina Aguilera Approached for Michael Jackson Tribute
Sources connected to the concert tell us ... Jay-Z, Kanye West, Cee Lo, Justin Bieber, Christina Aguilera, Usher and Bruno Mars have each received an invitation from Katherine Jackson ... asking them to perform 1 or 2 of their favorite MJ songs in Cardiff, Wales on Oct. 8.
Katherine promises each star who signs on will be provided with "first class travel accommodations."
We're told Justin Bieber and Bruno Mars have each respectfully declined the invite due to scheduling conflicts ... however, Christina and Kanye are leaning towards "Yes."
As for the one person who's already signed on the dotted line -- sources tell us Cee Lo from Gnarls Barkley was quick to commit.
Tickets to the event have not gone on sale yet -- but promoters say they will become available once a complete line-up is booked. more on this story