Madonna and David Beckham's sons are forecast to become the richest celebrities in Britain.

Youngsters Rocco Ritchie, nine, and Cruz Beckham, four, are tipped to have the most earning power in a new report which assessed the estimated worth of today's celebrity children in 20 years time.

Britain's Prince Harry will become a millionaire next week. The royal will inherit his share of the estate left by his mother, the late Princess Diana, when he turns 25 on Tuesday.

It is estimated the amount could be as much as £9 million [$15 million]. However, the prince, like his brother Prince William, is banned from spending any of the money until he is 30.

Britain's Prince William and girlfriend Kate Middleton shocked cinema-goers by popping in to watch a movie. The heir-to-the-throne and his partner of around eight years sneaked into a showing of "The Hangover" - in which a group of men go on a stag night and wake up the following morning with no memory of what happened - in West London.

A source said: "No-one expected royalty but they acted like normal people off the street. It was dark so not many people had any idea who they were. I think they liked the anonymity."

Britain's Prince William will reportedly marry in 2012. The prince and long-term girlfriend Kate Middleton, both 27, have an "understanding" that they will walk down the aisle before Queen Elizabeth's diamond jubilee in 2012 after William and brother Prince Harry have been established as a "winning double act" in a series of interviews, official engagements and foreign trips planned for next year.

Kate Middleton is preparing to start a series of "princess classes." The 27-year-old beauty will reportedly be taught how to be a "fully-fledged" member of the royal family ahead of her expected engagement to Britain's Prince William.

William's mother Princess Diana, his aunt Sarah Ferguson and step-mother Camilla all struggled to cope when they married into the royal family and courtiers are determined to ensure Kate doesn't have the same problems.

Britain's Prince Harry is getting motorcycling lessons from a champion racer. Sunshine Coast rider Chris Vermeulen was stunned when he received a call from Buckingham Palace inviting him to visit London to meet the prince, a keen bike fan.

Queensland-born Chris revealed: "Harry really enjoys his riding and he wants to get on the track. Obviously there are security issues with him being out on the circuit with a lot of people."