Usher holds up the award for favourite male artist Soul/R&B at the 40th American Music Awards in Los Angeles Reuters

He may have had his share of flings but r'n'b superstar Usher Raymond has only recently found out just how powerful a women's vagina can be.

The Good Kisser singer, who is currently dating his manager and Def Jam executive Grace Miguel, was able to charge his iPhone using a lady's private parts.

Raymond was at the Vector Gallery at Art Basel Miami when the bizarre incident occurred.

As part of the show, a woman named Lena Marquise sat naked with a charger inside her vagina and offered her services to those whose batteries were running low. For $20 (£13) Raymond was able to charge his handset for 10 minutes.

The performance artists described as "PostHuman" was reportedly hoping to prove how dependent society has become on technology.

The 35-year-old entertainer's raunchy run in comes weeks after he enlisted the help of a top lawyer to hunt down the person trying to sell his stolen sex tape around Hollywood for an undisclosed sum.

An X-rated video featuring the singer and former wife Tameka Raymond got into the wrong hands back in 2009 after two laptops, two video cameras and hundreds of thousands of dollars' worth jewellery was stolen from his car.

He is hoping to stop the video ever going public by claiming it is stolen property.