50 Cent has taken a sly swipe at rap rival JAY-Z, insisting the 99 Problems hitmaker was a "no one" until he wed Beyonce Knowles.

Superstar Jay-Z, real name Shawn Carter, wed the Bootylicious beauty in April and 50 Cent claims it was their union - not the rap mogul's music – that raised his profile on the international scene.

He says, "I'm a big fan of Jay-Z, but outside of the States and hip-hop circles, no one really knew who he was until he married Beyonce."

The In Da Club rapper has also disputed reports that Jay-Z is worth an estimated $1 billion, but is adamant he's not jealous of his fortune.

He adds, "I don't believe he's worth that much! It's all been exaggerated. I'm comfortable. I don't want for anything so I'm not in a race."

50 Cent recently topped Forbes magazine's poll as the biggest earning hip-hop star of 2008, making $150 million in the last 12 months, compared to Jay-Z, who came second with $82 million.