UK queen enjoys Platinum Jubilee horse spectacle

UK's Queen Elizabeth II was all smiles on Sunday as she attended a special Platinum Jubilee celebration outside Windsor Castle. This year's Royal Windsor Horse Show celebrated the 70th anniversary of her enthronement with a special show, called "A Gallop Through History".

More than 1,000 performers and 500 horses from around the world enacted key moments of royal history. The queen's public appearances are being closely watched as the country prepares to celebrate her long reign with four days of festivities June 2-5.

The event is one of the queen's most important public appearances, highlighting her constitutional role as head of state.