During the run of his [article id="1640339"]Invitation Tour, 50 Cent[/article] has been bringing out guests from E-40 to Carmelo Anthony. One guy who almost became a surprise for the fans was his good friend Eminem. Slim Shady, however, had to spend time with his family.

"He wanted to come to my performance in Detroit. He was on baby watch," 50 said last weekend in Los Angeles, when he was backstage at the House of Blues with another one of his onstage guests, boxer Floyd "Money" Mayweather. "He was like, 'Yo, I wanna come out there, but I gotta stay. Hailie and them looking at me now.' He had to get off the phone, they was like, 'We have to go.' We talked for a little bit -- he was trying to figure when he could expect [my] next record. He was like, 'Do like I make my records, like Dre makes his records. [Put it out] when you feel happy with it 100 percent.' "

"You could take your time," Mayweather added. "You could take your time and make the record special."

[article id="1633941"]50's Black Magic LP[/article] is still a ways off, but the rap giant has been filming a slew of movies in the past year, including the drama "Things Fall Apart." He plays a football star stricken with cancer. [article id="1640134"]50 lost 54 pounds[/article] in less than three months for the role.

"I'm glad you got your weight back," Mayweather said to Fif. "I was getting worried. Everybody was telling me [about the picture posted on his website]. I'm not an Internet freak."

"I went from 214 to 160," The G-Unit General said. "I was on a liquid diet for nine weeks.

"I was in Baku, [Azerbaijan,] and I ran from the airport to the hotel," he added, referring to one instance in his training. "I was doing a lot of treadmill running, but it's mental. When you get on the street, you could run. On the treadmill, you start thinking about the time. If you got the same music playing it gets difficult after a while. You gotta have something to distract you."

"When you running on the street, you in control. When you're on a treadmill, you're not in control," Money May added. "I didn't see this [picture] yet, I gotta go check it out."

Fif says not having anything to eat made him angry.

"I was real hungry," he explained. "I was pissy. Any little thing, it was like, 'Get the f--- from around me.' "