When Bryan Boy tweated that Anna Wintour was wearing jeans, I thought he was playing a twisted April’s Fool joke.

As its April 2nd, I then prayed that she’s wasn’t wearing Jessica Simpson mum jeans.

With my fingers crossed I clicked the link find Ms Wintour looking refreshingly relaxed in her J Brand “914” low-rise cigarette leg jeans and a Proenza Schouler top.

She was papped wearing the jeans yesterday whilst enjoying her second love – tennis – during the Sony Ericsson Open at Crandon Park Tennis Center in Key Biscayne, Florida.

I think this is a first.

Does anyone else remember seeing her wearing jeans before? She usually wears Oscar de la Renta to tennis matches.

Some of you may remember that Anna Wintour’s first ever November 1988 American Vogue cover featured a model wearing Christian Lacroix Couture and a pair of jeans.

Jeans are clearly a part of her fashion history.

Credit: Getty

American Vogue’s Editor-in-Chief Anna Wintour graces the cover of The Wall Street Journal magazine for April 2011.

The editor is used to putting faces on the cover of magazines, so I wonder how she feels about seeing herself on the cover.

Mario Testino was of course the natural choice to shoot this cover, as was her Prada Spring 2011 dress, bejeweled necklace and Chanel sunglasses.

I will bet my life she was also wearing her favourite beige kitten heels.

The article is called “The Business of Being Anna.”

It profiles the world’s most influential person in fashion today; discussing her reach and power within the industry.

Credit: Mario Testino