Curtis Jackson aka 50 Cent sneaked into the country this week as part of a low key charity mission to aid hungry children in Somalia and Northern Kenya.
In November last year, 50 launched a project called Street King, which was intended to help raise money to feed thousands of starving children in the Horn of Africa.
Street King is an energy drink that 50 says is made of natural caffeine and it guarantees six hours of focus and energy. With the project, for every drink that is bought, one meal is given in exchange to help feed children in Somalia.
Sources told Capital Newsbeat that the wealthy musician and actor is meant to leave the country today, as quietly as he came in.
The last high profile celebrity to visit Kenya was Brazilian millionaire model Gisele Bundchen. Officials say they kept her visit as quiet as possible due to threats against foreign nationals by Al Shabaab militants from Somalia.
Several foreign nationals have been kidnapped by the rogue militia, who demand ransom in exchange for their freedom.
While in Nairobi, 50 Cent was staying at the upmarket Sankara Hotel in the Westlands area.