Christina Aguilera, Cee Lo Green headlining Michael Jackson UK tribute concert

(CBS/AP) Christina Aguilera and Cee Lo Green are among the performers headlining a Michael Jackson tribute concert planned for October in Wales.

Organizers of "Michael Forever - The Tribute Concert" announced Thursday that the duo, who both serve as mentors on NBC's "The Voice," would be joined by members of the Jackson family, Leona Lewis and Motown veteran Smokey Robinson.

Pictures: Michael Jackson
Pictures: Christina Aguilera

The rock band Alien Ant Farm, which is known for its cover of Jackson's song "Smooth Criminal," and British pop star Craig David are also included in the lineup. More acts are expected to be announced.

Thursday's announcement came after more than two weeks of silence about performers for the Oct. 8 show at Millennium Stadium in Cardiff, Wales.

While the event is endorsed by the singer's mother and some of his siblings, brothers Randy and Jermaine Jackson have protested its timing. The concert is scheduled during the trial of a doctor charged in Jackson's death.

The singer's estate is also not affiliated with the concert.