Model Liz Hurley and her husband Arun Nayar have separated, she said on Twitter.
The revelation follows newspaper claims that she has been having an affair with Australian former cricket star Shane Warne.
She tweeted: "Not a great day. For the record, my husband Arun & I separated a few months ago. Our close family & friends were aware of this."
Ms Hurley, 45, who has an eight-year-old son, Damian, married Indian businessman Mr Nayar three years ago.
The News of the World claimed she spent two nights with Warne, 41, in his London hotel suite last week.
Ms Hurley and Mr Nayar married in a civil ceremony at Sudeley Castle in Winchcombe, Gloucestershire, in 2007 and held a blessing and party at the castle the following night.
They then had traditional Indian wedding celebrations at the Mehrangarh fort in Jodhpur.
Ms Hurley became known as a girlfriend of actor Hugh Grant in the 1990s and attracted attention in 1994 when she wore a Versace dress held together with giant safety pins.
She gave up city life for a Gloucestershire organic farm, and said last year: "My son Damian is so much happier there - having fresh air and running around outside. We made the big decision last Easter to move down there full time - which was a big, dramatic change for a city girl - but I love it, I couldn't love it more."