(Cover) - EN Showbiz - Russell Brand looked "downbeat" as he went out without his wedding band yesterday.

The British actor was spotted shopping in London just days after his wife Katy Perry was seen without her ring.

Rumours of trouble within their relationship have been circulating for weeks.

"Russell looked pretty downbeat. He spent most of the time on his phone and clearly had things on his mind," an onlooker told British publication The Sun.

The pair spent Christmas Day apart after reportedly having a huge fight.

Katy decided to celebrate the holiday in Hawaii, while Russell was back in the UK with his friends.

"They had a massive fight," a source told Us Weekly. "She was like, 'F**k you. I'm going to do my own thing.' Russell replied, 'Fine, f**k you too.'"

The source suggested that the couple were experiencing difficulties because Russell refused to take Katy's parents Christian beliefs seriously.

The pair were married in a Hindu ceremony in India last year.

Just weeks ago Russell Brand denied rumours that his marriage was over.

"I am really happily married," he said in an interview with Ellen DeGeneres. (C) Cover Media