Justin TimberlakeJustin Timberlake doesn’t approve of Britney Spears‘ marriage to Kevin Federline or Kevin’s attempts at rapping, according to reports in Star magazine.

A source told Star: “He thinks Kevin is gross, and there’s not much that would change his mind about that.

“He says [him and Britney] had a lot of great years together, and he’s pretty sad at how things have turned out for her.”

“He’s definitely not impressed with Kevin’s showbusiness aspirations, and he thinks the guy is more and more like a walking punch line.

“But because he and Britney don’t talk much, there’s not a lot he can do about it - other than watch what goes down between them like it’s a slow-motion car wreck.”