Michael Jackson - King of Pop in the 1980s - has released his first single for four years.
You Rock My World hit the shops on Monday and will be followed by his first studio album for six years, Invincible, at the end of October.
Jacko has been a mega star since he was five and is famous for singing massive hits like Thriller - as well as his amazing videos.
But over the years he's become as famous for his plastic surgery and weird habits that have earned him the nickname Wacko Jacko.
He's also the man who got people into moonwalking, and made wearing white socks with black shoes cool - well, twenty years ago at least.
But with the likes of Kylie and Sam Mumba at the top of the charts, Jacko's got a battle to reclaim the top spot all over again.
