Rihanna has treated fans with a sultry snap on Instagram as she continues her Diamonds world tour.

The 'Stay' singer is currently touring the US as she promotes her 2012 record 'Unapologetic'.

The Barbados star, who is no stranger to posing in the front of the camera wearing very little clothing, updated fans with a pre-show photo on Instagram.

It saw Rihanna go topless with only a towel covering her breasts as a helper worked with her hair before the big show.

The singer performed in Atlanta, Georgia after the photo was taken, with a host of world tour dates still to come this year.

As previously reported, Rihanna recently cancelled the third date of her North America tour after falling ill.