The Monarch attended the fun-filled event which celebrates glamorous outfits and extraordinary hats of the women who head to watch the races.
And the huge horse fan was at the finishing line to see 16/1 outsider Masar won the Epsom Derby.
The horse, ridden by William Buick, took home the £1.5million prize in a huge upset.
The Queen complimented her lilac outfit she wore black shoes, white gloves and carried her trademark handbag.
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