A day after meeting at a concert in the Caribbean, Britain's Prince Harry and pop queen Rihanna took an HIV test in public to raise awareness about the illness on World Aids Day.

On Thursday, Kensington Palace shared a video on Twitter of the two having their fingers pricked at an event held by the Barbados National HIV/Aids Commission at a clinic in Bridgetown, Barbados' capital.

Prince Harry, 32, is on a two-week tour of the Caribbean on behalf of his grandmother, the queen.

He and Rihanna, a Barbadian, were in Barbados for the celebration of its 50th anniversary of independence.

Harry made a face after the needle was taken out. Rihanna, however, said to him, after her finger was pricked: "Oh, that's not bad. You made it seem like it hurt."

She wrote on Instagram: "Couldn't believe how easy this was to get tested and find out my status on the spot! So easy you can order your own kit and do it at home!"

They tested negative.

The prince had persuaded Rihanna, 28, to take the test with him when they attended a concert celebrating Barbados' 50th anniversary on Wednesday night, according to reports.