As one of the biggest Michael Jackson fans in the public eye, Chris Brown has not hidden the fact that he wants to carry on MJ's legacy as he's performed many tributes to the fallen "King of Pop." But when Michael's mother Katherine reached out to Chris, he declined on the offer.

Other celebrities including Jay-Z, Kanye West, Cee Lo, Chris Brown, Justin Bieber, Christina Aguilera, Usher and Bruno Mars have also been invited with a request to perform 1 or 2 of their favorite MJ songs in Cardiff, Wales on Oct. 8.

While Cee-Lo jumped at the opportunity, Kanye and Christina are still leaning towards 'yes,' but Bieber, Bruno Mars & Chris Brown have respectively declined.