Gwyneth parties on – without Mr Paltrow

When Gwyneth Paltrow stepped out in a stunning frock and sparkling diamonds for the Fashion Rocks concert last week, there was one significant accessory missing – her husband Chris Martin.

In what appears to be an increasingly common factor in the couple's four-year marriage, Gwyneth – who has been in the UK for the past fortnight – was left to attend the glittering showbusiness party without her husband and father of their two children.

Scroll down for more...

When I asked her where the Coldplay singer was, she declined to comment and walked away.

The week before, the 34-year-old Oscar-winner was at another party where one guest overheard her brush off questions about her husband.

"It was like Gwyneth didn't want to talk about him," my source tells me.

"It was very strange. They haven't been out together for months."

While she has spent recent months in America completing Iron Man, her first movie since giving birth to her son Moses in April 2006, Chris has been working on Coldplay's new album in London.

"He's been working hard in the UK," a source said.

"But he insists everything is OK with him and Gwyneth."

The actress has told friends she is keen to spend more time in America, where she has just finished refurbishing the family's new home in the Hamptons.

"Gwyneth has wanted to return to the States permanently for a long time but Chris has said no," the source continues.

Gwyneth's publicist says: "Gwyneth and Chris as a policy do not talk about each other in the media, nor do they attend public functions together. They have not been apart all summer as you suggest and she does not want to move to America."