Who's who in the royal box at Wimbledon? Kate Middleton's parents, adventurer Bear Grylls and cricket star Pat Cummins watch the action on day four

Wimbledon day four has commenced, meaning a host of VIPs are watching the action live from the Royal Box.

As the name suggests, the box often houses members of the Royal Family, notably the Princess of Wales, patron of the All England Lawn Tennis and Croquet Club.

While Kate did not attend today amid her cancer diagnosis, her parents, Michael and Carole, made a special appearance at the tennis tournament.

It is unknown which royals will attend this year's tournament - with the Duchess of Gloucester making an appearance yesterday - but other recognisable faces were in the box today, including Australian cricketer Pat Cummins and adventurer Bear Grylls .

Here, FEMAIL reveals some of the high-profile guests in the Royal Box at Wimbledon today.

Carole and Michael Middleton

The Princess of Wales 's mother and father - Carole and Michael Middleton - attended day four of Wimbledon in their second public appearance since their daughter's cancer diagnosis.

The beaming couple, dressed in all their finery, looked in good spirits as they sat in the Royal Box side-by-side for the prestigious event in London .

It follows their cheerful appearance at Royal Ascot last month, when they joined members of the Royal Family , including their son-in-law Prince William , at the lavish occasion.

Carole, 69, cut an elegant figure in a floral dress with a cropped white blazer as she watched the live action, while her husband, 75, sat beside her and looked equally dapper in a navy suit.

The Middletons, who live in Berkshire, typically attend several days of Wimbledon but are usually only invited to sit in the Royal Box once per tournament.

It marks a well-deserved day out for Carole and Michael, who have reportedly been supporting her daughter through her cancer treatment at her home in Windsor.

Bear and Shara Grylls

British adventurer Bear Grylls swapped treacherous and remote conditions for the comfort of the Royal Box today.

Grylls, 50, is an Eton College alumnus - the same school attended by Prince William and Prince Harry. However, being eight years older than William, Bear did not share classes with either of the princes.

Despite this, Grylls is said to be close friends with the Prince of Wales and has collaborated with him and Prince Harry on various wildlife conservation projects throughout the years.

He sat alongside his author wife, Shara Grylls, 50, with whom he shares three children.

The pair tied the knot in 2000 after a whirlwind romance, having known each other for about two years.

The adventurer has previously revealed he and Shara entered marriage counselling at the beginning of their union as a preventative measure to guide them through married life.

Shara has written two books since the marriage, the first of which - Marriage Matters - was released in 2009.

Pat and Becky Cummins

Australia men's cricket captain Pat Cummins took his seat in the Royal Box for the fourth day of Wimbledon alongside his wife, Becky.

The 31-year-old cricketer was once a prodigious teenager, famously mentored by the great Australian cricketer Dennis Lillee.

He has since broken his master's records, reaching 250 Test wickets with a superior average and strike rate - while captaining his country.

Among Australian pace bowlers, only Lillee and Glenn McGrath (55) have gotten to the 250-wicket mark in fewer Tests than Cummins' 57 (Mitchell Johnson also achieved the milestone in 57 Tests).

He is the 10th bowler from Australia to reach the mark, joining teammates Mitchell Starc (342 Test wickets) and Nathan Lyon (505) on the coveted list.

The sportsman attended Wimbledon with glamorous wife, Becky Cummins. Becky married the Australian cricket captain Pat in a lavish ceremony in Byron Bay in July 2022.

The pair, who share a son, Albie, tied the knot in the French-inspired Chateau Du Soleil, surrounded by family and friends.

They welcomed Albie in October 2021, with Pat tweeting at the time he was 'beyond besotted' with the baby boy.

Bill and Cynthia Bryson

Travel writer Bill Bryson travelled to SW19 with his wife Cynthia to observe the fourth day of Wimbledon today.

The esteemed writer came to the UK while backpacking across Europe in his early 20s. He landed a job in a psychiatric hospital where he met a fellow nurse, Cynthia Billen, whom he went on to marry, and the pair had four children together.

He and Cynthia moved back to Des Moines, Iowa, in 1975 so Bryson could finish his degree, but the pair settled in the UK in 1977 and currently live in Hampshire.

Bryson began his writing career in the late 1970s as a journalist for the Bournemouth Evening Echo and eventually became chief copy editor of the business section of The Times and deputy national news editor of the business section of The Independent.

He wrote his first book -The Palace under the Alps and Over 200 Other Unusual, Unspoiled and Infrequently Visited Spots in 16 European Countries - in 1985.

But the famed writer, who was awarded an OBE in 2006, holds A Short History of Nearly Everything, published in 2003, as his most treasured book.

Bill was born in Iowa but has predominantly lived in the UK since the 1970s. In 2020, the Notes from a Small Island writer, 72, announced his retirement, saying he has decided to 'indulge himself rather than explore new territory' .

At the time, the author said he has been 'treating retirement as an experiment so far this year but it has been successful'.

Sebastian and Harry Coe

They were the father-son duo of the Royal Box as they took to the fourth day of Wimbledon.

Lord Coe won gold in the 1500m at the Olympics in 1980 and 1984, was a Tory MP for five years, and masterminded the London 2012 Games.

Now the President of the International Association of Athletics Federations, Sebastian splits his time between Monaco and London.

The former Conservative MP, who has four children, was accompanied by his eldest son Harry for the event.

Harry has previously spoken out about his desire to follow in his father's footsteps into the world of sport.

Sebastian recently made headlines after declaring that female Olympians would never win a gold medal again if they had to compete against transgender athletes.

Lord Coe suggested in an interview that the gap is so large that females competing at the Olympics wouldn't stand a chance against trans women.

The president of the sport's governing body - who last year announced a ban on trans women from female competitions - says the matter is 'very clear cut'.