It's really tough to be a performer.. you just never know what's going to slip out. It happened to many artists and Rihanna is no exception. Check it out closer or enlarge the pic.. you'll know what I'm talking about.
Enough with crying foul already. They do have nip slips all over the world. Anne Curtis' nip slip at Boracay Beach during ASAP XV taping was kind of well... more exposed than the normal slip. Then came the Karylle (Photoshopped)