50 Cent thinks Jay-Z is too old to continue touring. The "Candy Shop" rapper believes the hip-hop mogul signed his recent deal with Live Nation - which sees the company handle all of his records, touring, merchandising and marketing - because he is at an age where he doesn't feel he needs to continue negotiating different aspects of his professional life.

50 - real name Curtis Jackson - explained: "Jay is in a different space in his career. He may be tired of running around and negotiating each individual deal. The deal would be actually putting that in someone else's hands."

50 Cent wants to launch a diet supplement. The rapper - real name Curtis Jackson - is considering creating his own range of vitamin-enriched pills but refused to be drawn on the details.

He is quoted by the New York Daily News newspaper as saying: "Right now, I'm interested in dietary supplements. I'll be coming up with something very soon."

50 Cent says he works out like a woman. The muscular rapper says his toned physique is the result of "girly" weight-free routines rather than pumping iron.

He said: "It's intense, and there are no weights involved. And some of it's like girly stuff, like just kicking your leg, but it's muscles you don't really ever work at. Men don't usually go to the gym and say, 'I'm going to develop my a*s. This'll be the J.Lo workout.'"

Jim Carrey was serenaded by 50 Cent on his birthday. The "Yes Man" actor and his girlfriend Jenny McCarthy were watching the rapper perform on Saturday when 50 spotted them in the crowd and asked Jim to join him on stage in Park City, Utah.

A source said: "Jim and Jenny were dancing and really getting into the music, so 50 decided to bring him out to the balcony for a special rendition of 'It's Your Birthday.'" "When Fiddy told the crowd, 'I have a very special guest for you,' everyone was floored because he had just done a duet with Robin Thicke. They thought the surprises were over.

50 Cent has hinted he believes his ex-girlfriend started the fire which destroyed his $1.8 million home earlier this year. The U.S. rapper - real name Curtis Jackson - refused to openly blame Shaniqua Tompkins for the blaze in May, but did confirm she was ordered to leave his home in Dix Hills, New York, just days before it was torched.

Speaking to Quddus Philippe, correspondent for U.S. TV show "TV One Access," 50 said: "The courts told her she had to leave. It's kind of more like, 'If I can't have you, you can't have it.'"