Top pop acts from the U.K., the U.S., and beyond took part in what's being called the biggest birthday party on record in London's Hyde Park yesterday (July 8), as 100,000 people attended the fourth a

Top pop acts from the U.K., the U.S., and beyond took part in what's being called the biggest birthday party on record in London's Hyde Park yesterday (July 8), as 100,000 people attended the fourth annual Party in the Park concert to mark the 25th anniversary of the royal Prince's Trust charity.

The concert, spearheaded by London CHR station Capital FM, was broadcast live across the U.K. by the Capital Radio Group and the ITV Network and is estimated to have raised #1 million (U.S. $1.4 million) for the cause, to add to the #1.5 million (U.S. $2.1 million) realized by its three predecessors.

A wealth of current chart superstars performed at the eight-hour extravaganza, which was opened by Ricky Martin and completed by a retro-medley featuring Dane Bowers, Lulu, and former Hot Chocolate star Errol Brown. Highlights included a hugely popular set by Shaggy, performing his recent No.1 singles "It Wasn't Me" and "Angel," and impressive contributions from such domestic artists as Atomic Kitten, Emma Bunton, David Gray, Craig David, Catatonia, and Tom Jones. Other international artists included Usher, Anastacia, Wheatus, Nelly Furtado, Wyclef Jean, Sisqo, and Destiny's Child.

In a welcome progression, almost all acts sung live, after last year's concert attracted widespread criticism when the majority of acts lipsynched their vocals. Atomic Kitten appear to have won the battle of the photo-opportunity, according to today's print and internet media: an image of the trio posing with Prince Charles holding an "I love AK" T-shirt garnered vast coverage. The Prince was also presented with a 25th anniversary cake on behalf of the charity backstage by Destiny's Child.

The Prince's Trust has provided assistance, training and career opportunities for some 400,000 disadvantaged young people since launching in 1976.