'Dance Crew' Judge Shane Sparks -- I Believe Wade Robson

Former "America's Best Dance Crew" judge Shane Sparks -- a convicted statutory rapist -- has Wade Robson's back ... telling TMZ, he believes Michael Jackson molested the choreographer.

TMZ broke the story ... Wade has filed a claim with the MJ Estate, alleging the King of Pop molested him for 7 years, from the time he was 7 until he turned 14.

Shane tells TMZ, "I've been knowing Wade forever. Because of the man he is, I do believe him. I don't think he would lie about this because this could hurt him ... He don’t need the publicity or the money. I think this is something that has been on his mind and he had to get it off."

Shane tells us, a big clue emerged soon after he met Wade, who was not much older than 7 at the time.

According to Shane, Wade's tiny apartment was filled with ridiculously expensive electronics -- mixing boards, beat machines, video games, and other "rich kid" toys ... all of which were gifts from Michael.

Shane says Wade was so tight with MJ, he was allowed to host birthday parties at Neverland Ranch without Michael present -- and the only room that was off limits was Michael's bedroom.