King Charles joined by nieces Zara and Eugenie at Royal Ascot

The King was captured doffing his top hat to the crowd as he and the Queen arrived in the parade ring.

Princess Eugenie looked elegant in a taupe cropped top and a high-waisted white skirt with a matching hat as she appeared at Royal Ascot for the first time this year.

And Sarah, Duchess of York had her own fashion moment as she revived a Catherine Walker polka dot outfit first worn in 1991. 

She teamed it with a black Jess Collett hat and an Ethan K handbag. 

Zara performed the perfect curtsy as she greeted her uncle, King Charles, in the parade ring.

Charles greeted his niece, Princess Eugenie, with a kiss on the hand. Aww!

Eugenie and Charles had a good chinwag. The princess, who is mum to sons August, four, and Ernest, two, was recently announced as a mentor for The King's Foundation 35 under 35 programme.

Eugenie bobbed down into a curtsy as she greeted Queen Camilla.

Sophie and her husband, Frederick, also joined the royals on day four.

The actress looked chic in a navy dress with white detailing on the cuffs and collar, accessorising with an ivory patent croc leather handbag from Aspinal.

She finished her vintage-inspired look with a pop of red lipstick.

Zara put in a fourth stylish appearance at Royal Ascot. 

The equestrian looked effortlessly chic in a baby blue Veronica Beard trouser suit with a blue and white hat by Jenny Roberts Millinery, as well as a white leather clutch from Aspinal. 

Her Majesty kept her cool in the heatwave in a white chiffon dress with embroidered flowers by Anan Valentine, with a matching feathered hat by Philip Treacy. 

She carried a quilted Lady Dior bag and accessorised with the late Queen's raspberry pip brooch.