This week has given rise to a flurry of rumours that Katy Perry and Russell Brand are about to call time on their marriage.

But now the couple have hit back at the split rumours, via Twitter and a TV appearance.

First to speak out was Katy, 27, who quipped on Twitter, "First I'm pregnant & then I'm divorced. What am I All My Children?! Erica Kane? Pshhh #ifihadadollarforeverytime ..."

Russell, 36, soon backed her up during a recording for Friday night's episode of The Ellen DeGeneres Show.

"I am really happily married," he tells Ellen on the programme, before joking that it's tough to avoid online gossip because "a lot of the nude women web sites I quite enjoy."

Katy's last appearance was at the Grammy nominations ceremony in Los Angeles on Wednesday evening, where she still wore her wedding ring and said backstage that she was looking forward to spending some time off with her husband.

But divorce rumours were fuelled by the fact that Russell was not present at the event, despite performing in California the previous night.

The pair married in a lavish ceremony in northern India last October, complete with acrobats, jugglers and two elephants.

"I always knew I wanted a great man of God, someone who was going to be an inspiration for people and also be a lovely husband and father," a newlywed Katy said of Russell late last year.

Katy Perry denies divorce rumours