Kate Middleton and Prince William De-Stress by Watching The Avengers in Kensington Theatre

Kate Middleton is full of surprises.

The Duchess of Cambridge was recently spotted at a theatre in Kensington, with Prince William. The royal couple had gone to see The Avengers and wound up shocking the people around them.

A lady was so excited seeing the royal couple she tweeted: "OMG watching the Avengers with Kate Middleton and Prince William sitting right next to me!!!!!"

The royal couple must be used to being stared at by now, for they seemed not to be bothered by the attention. The duo were taking some time off after the hectic schedules surrounding the celebrations of the Queen's diamond jubilee. According to the Daily Mail, Kate wore blue skinny jeans, heels and a denim jacket. Prince William wore a shirt, blue jumper, glasses and a baseball cap.

After the film, Prince William and Prince Harry visited the Duke of Edinburg at hospital. The Duke was admitted after a urinary bladder infection.

Meanwhile, with all the hype surrounding the diamond jubilee, the Duke and Duchess have been facing pressure to announce their first child, amidst rumours a baby bump has been spotted on Kate Middleton.

"I'm just very keen to have a family and both Catherine and I are looking forward to having a family in the future," Prince William said in an interview on an American show, The Jubilee Queen.

"William's main goal is to be a father. But at the same time he loves the thought of staying in the forces," a source told Now magazine, implying the Prince had to decide between his career in the Royal Air Force and spending time with his family.

"I'm still trying to decide. It's a really difficult one because I really enjoy my time in the Air Force. But the pressures of my other life are building and fighting them off or balancing the two of them has proven quite difficult. More importantly, I'd rather like to have children," he said.