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