Published Friday, 27 July 2012
The boxer is currently behind bars serving a three-month prison sentence for domestic battery and was unable to be with his partner, Shantel Jackson, on her special day.
He made sure she had a good time by paying for her to go out to dinner at the N9ne Steakhouse in Sin City, and also bought a cake shaped like a Balenciaga handbag, a diamond watch, bracelet and ring.
50 Cent was there to help Jackson celebrate and he posted pictures of her opening her presents on Twitter.
In a series of posts, he writes: "Happy birthday Ms Jackson... Got (sic) damn this must be love, Floyd going hard from jail... Balenciaga alligator bag $30,000, birthday cake priceless. Want a slice."
Jackson stars alongside the rapper in upcoming movie Crossfire. Mayweather Jr is expected to be released from prison next month.