Celebrity couple Ashton Kutcher and Demi Moore have been spotted out in public together despite rumours that their marriage is in trouble.

Reports had claimed that Kutcher had allegedly cheated on Moore with a 23-year old woman sparking a series of cryptic Tweets from both Ashton and Demi.

Moore and Kutcher, who married in 2005, were spotted at LA's Kabbalah Centre on Friday, where they were taking part in prayer service.

According to gossip site X17 Online, both stars were wearing their wedding rings, although a photographer for the site described the couple's mood as tense, saying: "[Demi] clearly did not want to be photographed… Ashton really looked worried. He wasn't really in a good mood - his MO (modus operandi) was definitely to get into the centre and get out without being seen."

Ashton, who has now replaced Charlie Sheen in Two and a Half Men, told fans last week via Twitter not to "assume" anything about his and Demi's marriage, tweeting "When you ASSUME to know that which you know nothing of you make an ASS out of U and ME".