Queen Elizabeth was born on April 21st, 1926 but her official birthday is in June. 

Yesterday, there was a 41-gun salute in Hyde Park and 21-gun salute in Windsor Great Park at midday, ahead of a 62-gun salute at the Tower of London at 13:00 BST.  There was also a 21-gun royal salute fired from Edinburgh Castle.

Bells pealed at Westminster Abbey to mark the occasion and Irish Guards performed a rendition of Happy Birthday to You outside Buckingham Palace.

The Queen has celebrated her 91st birthday by taking part in one of her favourite activities - watching the races at Newbury Racecourse (horse races) from the royal box. 

On Friday, one of her horses, 'Maths Prize' was running but didn't win.

On Saturday , another horse of hers, 'Call to Mind' won. The Queen congratulated the jockey Ryan Moore and spoke to the racing manager and the trainer.

It is thought that Call to Mind won the Queen around £5,175.

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