On June 20, 2013, Autumn attended day 3 of Royal Ascot alongside her husband in a teal Diva dress that featured 3/4 length sleeves and a fitted silhouette. The dress featured a subtle V split at the top. 

She wore cream colored heels and carried a cream Emmy clutch. She kept her jewelry simple with just a pair of pearl stud earrings. As is traditional with Ascot, Autumn wore a cream colored hat by Gina Foster for the day's events. 

Autumn had the honor of sitting beside Her Majesty The Queen in the carriage procession at Ascot Racecourse. Prince Andrew and Peter Phillips accompanied the ladies. Princess Anne and Princess Beatrice were also in attendance on day 3. 

Autumn and Peter are known to make at least one appearance each year during Ascot with the Royal Family. 

Her Majesty handed out the trophy to the winners. Riposte won the Ribblesdale Stakes, Roca Tumu won the Britannia Stakes, Remote won the Tercentenary Stakes, Elidor won the King George V Stakes, and Her Majesty's horse, Estimate won the Gold Cup.