This might be a first. Totally unprecedented.

The nipple-bearing exhibitionist pop diva Rihanna covered up for once on stage tonight at the national Concert for Valor.

Many approved of her newfound modesty:

A reminder of her usual looks:

Not all of her fans were happy, though.

If only her f-bomb-dropping pal Eminem had shown similar restraint.

Previous Rihanna coverage (no pun intended) on Twitchy.