Nelly has revealed he smoked cannabis with Justin Timberlake.
The rap star became friends with the pop heartthrob after recording hit single 'Work It' together last year, and Nelly says the pair have enjoyed some wild nights out together.
He told Britain's FHM magazine: "You know I had to smooth my man out.
Justin's a good guy.
We did a Grammy party in New York. Me Justin and the rest of N-Sync.
"There were girls getting naked, dancing on tables. It was a crazy ass party. I think everybody enjoyed it."
The 26-year-old rapper also admitted he and Justin liked to gamble, but insisted their betting habits were under control.
He said: "I do a little bit of gambling but not so much it's gonna put me in trouble.
"Me and Justin will go out to the casinos when we're in Vegas."
Justin, who is romancing Hollywood actress Cameron Diaz, recently said cannabis should be legalised.
He said: "It would cut the crime rate in half. All the stoners I know are too paranoid to do anything stupid.