Correctional Services said that “matters are under control” at Johannesburg’s Sun City Prison on Wed.
R&B star Rihanna has hit out at fake people who want to befriend her because she's famous - warning them she will uncover their true motives.
The West Indian beauty has had to fend off hoards of wannabe pals since the launch of her career in 2005, and is sick of fame-hungry hangers-on trying to get close to her.
But the star has a "secret" weapon to discover if someone is a true pal - her "bull detector".
"I have a good bull detector, so I'm good at figuring out who is real and which people want to be my friend."
And the star doesn't believe in girls longing for a man to make their lives perfect - insisting women should control their own destinies.
She added: "You shouldn't depend on a guy to make your life better or good at all."