The Queen's final star-studded televised birthday celebrations will kick off tonight with an evening of entertainment chronicling the events of her life.
Presenters Ant and Dec will host the ITV show from the grounds of Windsor Castle in the presence of the Queen.
It will feature more than 900 horses and 1500 performers, as well as rare archive footage of the monarch.
Prince Edward and Princess Anne are rumoured to be making a surprise appearance in the show.
Downton Abbey star Jim Carter and his wife Imelda Staunton will celebrate the Queen's childhood years, with Carter narrating and Staunton singing.
Dame Helen Mirren will take audiences through the Queen's teenage years before Katherine Jenkins performs I Vow To Thee My Country. Alan Titchmarsh will talk the audience through the Queen's estates and her love of family, horses, dogs and the countryside.
Other performers include James Blunt and Dame Shirley Bassey, while Gary Barlow, Andrea Bocelli, Kylie Minogue and Damian Lewis will also take to the stage.
The Queen will watch the show with the Duke of Edinburgh, the Prince of Wales, the Duchess of Cornwall, the Duke and Duchess of Cambridge and Prince Harry.
The Queen's 90th Birthday Celebration airs on Sunday at 8.35pm on ITV.