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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.

The gift was a birthday present from the singer, who has collaborated with Beyonce in the past.

Lady GaGa has given Beyonce an unusual diamond gift for her 29th birthday.

She presented the former Destiny's Child member with a diamond-studded whip and lingerie last week.

Speaking to the Sun, one source said the whip was made from leather and hundreds of diamonds.

GaGa wanted to give Beyonce – who she worked with on the single Telephone earlier this year – "something special" for her birthday, the individual added.

The star also reportedly sang happy birthday and Beyonce was said to have "squealed with excitement" when she was presented with the custom-made gift while at one of husband Jay-Z's gigs.

Another popstar who is a fan of diamond jewellery is Rihanna, who has recently been immortalised in wax at Madame Tussauds in Washington, DC, where, according to People magazine, her statue sports a diamond ring and giant diamond earrings.

A spokesman for the attraction said the singer "absolutely loved" the model.