BREAKING Kate Middleton's parents Carole and Michael arrive at Wimbledon - but without Kate

The Princess of Wales' parents, Carole and Michael Middleton, have arrived at Wimbledon for day four of the tennis championships.

The Middletons are regulars in the Royal Box at Wimbledon so it's no surprise to see Carole, 69, and Michael, 74, turning up for the much-loved event. Carole was beaming and dressed in a floral dress, white blazer and yellow sunglasses for the occasion, with Kate's dad Michael looking dapper in a navy suit and yellow tie.

The Princess, 42, did not arrive with them, and it is not known if she will make an appearance later today, as she continues to recover from an undisclosed form of cancer. The Royal Family are huge tennis fans and are regulars at the London event, with Kate presenting the singles trophies to winners in recent years.

Over the years we've seen everyone from the late Queen to Meghan Markle take their seats in the royal box, cheering along with the crowds. Princess Diana and Sarah Ferguson famously used to go together, chatting and laughing as they sat side-by-side to watch the action unfold.

More recently, Princess Kate took sister-in-law Meghan along in one of their only joint engagements. Meghan, who is good friends with Serena Williams, was a tennis fan before marrying Prince Harry.

Meanwhile, Prince George and Princess Charlotte made their Wimbledon debut last year, and were seen getting very invested as Carlos Alcaraz took on Novak Djokovic in the Men's Final on Centre Court. So far, the competition has seen big names including Carlos Alcaraz and Emma Raducanu take to the courts once again.

Reigning men's champion Alcaraz started on the Centre Court as he looks to retain his title in what has been called the most open tournament in 20 years. The women’s singles will be as competitive as ever, with Coco Gauff and Aryna Sabalenka among those who will be looking to make it eight different winners in as many Championships.

Raducanu is one of seven Britons in action on the opening day. Heather Watson will be the first on court, taking on Greet Minnen at 11am, while Liam Broady, who reached the third round 12 months ago, takes on Dutchman Botic van de Zandschulp.

Charles Broom’s Wimbledon debut comes against three-time grand slam champion Stan Wawrinka on Court Two. Yuriko Miyazaki plays Tamara Korpatsch, Arthur Fery also has German opposition in Daniel Altmaier and Sonay Kartal will look for her first Wimbledon singles win at the third attempt against 29th seed Sorana Cirstea.