Beyonce has a mysterious tattoo under her wedding ring

Beyonce has had a mysterious tattoo inked on her finger under her wedding ring.

Beyonce Knowles has had a tiny tattoo inked on her finger under her wedding ring.

The pop star's mysterious body art is of the Roman numeral IV – a marking so small that it fits beneath her 18-carat diamond band – and she was photographed showing off the unusual design at a red carpet event in New York.

Reports have speculated the number four could be related to the former Destiny's Child singer's birthday, which is on September 4th, or even her anniversary with husband Jay-Z, which they celebrate on April 4th.

Recently, US pop star Jessica Simpson announced that she is engaged to marry NFL player Eric Johnson.

The blonde celebrity admitted her happy news after being photographed wearing a diamond ring in Kansas, sparking rumours that the couple had taken the plunge into married life following half a year of dating.

It will be the singer's second marriage after parting ways with ex-husband Nick Lachey in 2005.