The rapper wanted the bizarre sculpture to be displayed in his £2,500-a-night hotel room where he was staying ahead of his performance at the THISDAY Festival in Nigeria last week.
A source told Britain's Daily Mirror newspaper: "One giant watermelon was split in two and ornately carved into a mould of Beyonce's breasts. Two cherries were used as nipples."
The rapper - who controversially headlined Glastonbury earlier this summer, despite claims from Oasis guitarist Noel Gallagher that hip-hip wasn't right for the festival - performed a duet with Rihanna at the concert, dubbed Africa Rising.
The pair performed the Barbadian beauty's number one hit 'Umbrella' before Jay-Z went solo for a rendition of his duet with Beyonce, 'Crazy in Love'.
The concert - which aims to find sustainable solutions to the economic and political problems facing the continent - also featured performances from Mary J. Blige, Usher and a speech from model Naomi Campbell.
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