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OTRC: Prince William marks 29th birthday ahead of America trip with Kate

Prince William, son of Prince Charles and the late Princess Diana, turns 30 on June 21, 2012. He will receive a birthday present of about 10 million pounds sterling, or $15.7 million, which is the amount his mother left him in an inheritance fund, after taxes were deducted and interest was added. According to Hello! magazine, which has covered the British Royals extensively for years, Diana's will called for the bulk of her estate to be held in a trust for William and his brother Harry and then given to them when they turned 25. After she died, executors changed the inheritance age to 30, the outlet says. Check out photos of Prince William and his mother through the years. Did you know that on the day he was born, scores of people in celebrated outside the London hospital where Diana gave birth? (Pictured: Prince William dances the 'Swag Dance' with British woman Vanessa Boateng as his wife, Kate, the Duchess of Cambridge, looks on during their visit to Centrepoint's Camberwell Foyer in London on Dec. 21, 2011. Centrepoint provides housing and other support for homeless young people in London. This picture became a viral hit when it was first released.) (Prince of Wales Media Centre)

Prince William turned 29 on Tuesday, June 21, but does not appear to have any plans for a big party.

The prince, the son of Prince Charles and the late Princess Diana, is second in line to the British throne and serves as a helicopter search and rescue pilot in the Royal Air Force.

Palace officials told ABC News, that William planned to mark his birthday at work at a UK military base near Wales and may even pull a 24-hour shift.

People magazine said William would spend the day in his new home of Anglesey, North Wales and added that the prince will be on duty and have a "normal working week." (Check out which other celebrities celebrate birthdays in June.)

"William's birthdays were very normal, with friends," Dickie Arbiter, the Queen's press secretary during William's childhood, told ABC program "Good Morning America." "I remember him running around the palace in his Army fatigues."

William is meanwhile preparing for a trip to the United States and Canada in July with his new wife Kate Middleton, now known as Catherine, Duchess of Cambridge.

This marks their first North American trip as a royal couple. The two plan to tour Canada from June 30 to July 8, with stops in Ottawa, Ontario, Montreal, Quebec City and Calgary, Alberta. On July 8, William and Kate will fly to Los Angeles and are expected to depart on July 10.

The two married in London on April 29 in a ceremony watched by millions of people around the world, including more than 22 million viewers in the United States. Last month, the two honeymooned in Seychelles, an archipelago on the Indian Ocean.

William's brother, Prince Harry, also celebrated his birthday in September 2010 by continuing his military training to become an Apache attack helicopter pilot. It was reported earlier this month that the 26-year-old prince, who has since completed the course, may return to Afghanistan, where he served with the British military for several weeks, starting in 2007.

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