The Duke and Duchess of Cambridge headed to the races on Friday for the Cheltenham Gold Cup.

Kate, who is five months pregnant, hid her bump - nicknamed 'grape' - under a blush coloured Joseph coat, accessorised with a dark chocolate brown bow trimmed Betty Boop hat from Lock & Co, brown gloves, brown patterned tights and knee high brown boots.

william kate cheltenham

The Duke and Duchess of Cambridge study the Cheltenham form

Kate was enioying a day at the races just 24 hours after her sister, Pippa Middleton, visited Cheltenham with good friend, Tom Kingston.

The couple are expected to cheer on Monbeg Dude - the race horse owned by rugby star Mike Tindall, who is married to William's cousin Zara Phillips.

Tindall's horse is taking on its biggest challenge to date by running in the highlight of the four-day horse racing festival.

Zara previously revealed it was "probable" she called her husband an idiot after he bought the horse, which he knew nothing about, for £12,000 at a charity auction

"He just started bidding but he didn't know what he was bidding for," Zara said.

"He didn't know any of its form or anything but luckily the horse has won."

duchess cambridge cheltenham

The Duchess was looking happy as she took in the Gold Cup atmosphere

Monbeg Dude, trained by Michael Scudamore and co-owned by Tindall's fellow rugby players James Simpson-Daniel and Nicky Robinson, already has a number of wins to its name, including the Welsh Grand National.

William, was spotted browsing the race programme, as he and Kate watched the first race of the day.

prince william cheltenham

Prince William gets his ear bent. Perhaps his friend didn't appreciate a tip

Tindall's mother-in-law the Princess Royal and husband Vice Admiral Sir Tim Laurence were also at the Cheltenham Festival, according to the Court Circular.

Thoughts of many at the Festival were with leading amateur jockey JT McNamara, who remains in hospital in a coma after suffering a serious neck injury when his horse fell.

The Irishman, 37, fell at the first fence while riding Galaxy Rock for trainer Jonjo O'Neill in the Fulke Walwyn Kim Muir Challenge Cup yesterday afternoon.

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  • The Cheltenham Festival - Day 4

    CHELTENHAM, ENGLAND - MARCH 15: Catherine, Duchess of Cambridge attends day 4 of the Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in Cheltenham, England. (Photo by Danny Martindale/Getty Images)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, ENGLAND - MARCH 15: Catherine, Duchess of Cambridge attends day 4 of the Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in Cheltenham, England. (Photo by Danny Martindale/Getty Images)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, UNITED KINGDOM - MARCH 15: Catherine, Duchess of Cambridge attends day 4 of the Cheltenham Festival on Gold Cup Day at Cheltenham racecourse on March 15, 2013 in London, England. (Photo by Samir Hussein/WireImage)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, UNITED KINGDOM - MARCH 15: Catherine, Duchess of Cambridge attends day 4 of the Cheltenham Festival on Gold Cup Day at Cheltenham racecourse on March 15, 2013 in London, England. (Photo by Samir Hussein/WireImage)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, UNITED KINGDOM - MARCH 15: Catherine, Duchess of Cambridge attends day 4 of the Cheltenham Festival on Gold Cup Day at Cheltenham racecourse on March 15, 2013 in London, England. (Photo by Samir Hussein/WireImage)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, UNITED KINGDOM - MARCH 15: Catherine, Duchess of Cambridge attends day 4 of the Cheltenham Festival on Gold Cup Day at Cheltenham racecourse on March 15, 2013 in London, England. (Photo by Samir Hussein/WireImage)

  • Cheltenham Festival - Day 4

    CHELTENHAM, ENGLAND - MARCH 15: Catherine, Duchess of Cambridge arrives on day 4 of the Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in Cheltenham, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

  • Visitors Enjoy The Racing At The Cheltenham Festival 2013

    CHELTENHAM, ENGLAND - MARCH 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge watch the races on Gold Cup Day at Cheltenham Racecourse on the fourth and final day of the Cheltenham Festival 2013 on March 15, 2013 in Cheltenham, England. Approximately 200,000 racing enthusiasts are expected at the four-day festival, which ends today and is seen as many as the highlight of the jump racing calendar. (Photo by Matt Cardy/Getty Images)

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    The Duke and Duchess of Cambridge watch the first race during the Cheltenham Gold Cup Day on Day Four of the 2013 Cheltenham Festival at Cheltenham Racecourse, Gloucestershire.

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    The Duke and Duchess of Cambridge watch the first race during the Cheltenham Gold Cup Day on Day Four of the 2013 Cheltenham Festival at Cheltenham Racecourse, Gloucestershire.

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    The Duke and Duchess of Cambridge watch the first race during the Cheltenham Gold Cup Day on Day Four of the 2013 Cheltenham Festival at Cheltenham Racecourse, Gloucestershire.

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    The Duke and Duchess of Cambridge watch the second race during the Cheltenham Gold Cup Day on Day Four of the 2013 Cheltenham Festival at Cheltenham Racecourse, Gloucestershire.

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    The Duke and Duchess of Cambridge watch the second race during the Cheltenham Gold Cup Day on Day Four of the 2013 Cheltenham Festival at Cheltenham Racecourse, Gloucestershire.

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    The Duke and Duchess of Cambridge watch the second race during the Cheltenham Gold Cup Day on Day Four of the 2013 Cheltenham Festival at Cheltenham Racecourse, Gloucestershire.

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    Duke and Duchess of Cambridge watch the first race on Gold Cup Day, during Cheltenham Festival.

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    Duke and Duchess of Cambridge watch the first race on Gold Cup Day, during Cheltenham Festival.

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    Duke and Duchess of Cambridge watch the first race on Gold Cup Day, during Cheltenham Festival.

  • Horse Racing - 2013 Cheltenham Festival - Day Four - Cheltenham Racecourse

    Duke and Duchess of Cambridge watch the first race on Gold Cup Day, during Cheltenham Festival.

  • The Cheltenham Festival - Day 4

    CHELTENHAM, ENGLAND - MARCH 15: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge (R) watch the first race of the day on day 4 of the Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in Cheltenham, England. (Photo by Danny Martindale/Getty Images)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, ENGLAND - MARCH 15: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge (R) watch the first race of the day on day 4 of the Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in Cheltenham, England. (Photo by Danny Martindale/Getty Images)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, UNITED KINGDOM - MARCH 15: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge watch the races on day 4 of the Cheltenham Festival on Gold Cup Day at Cheltenham racecourse on March 15, 2013 in London, England. (Photo by Samir Hussein/WireImage)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, ENGLAND - MARCH 15: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge (R) watch the first race of the day on day 4 of the Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in Cheltenham, England. (Photo by Danny Martindale/Getty Images)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, ENGLAND - MARCH 15: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge (R) watch the first race of the day on day 4 of the Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in Cheltenham, England. (Photo by Danny Martindale/Getty Images)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, ENGLAND - MARCH 15: Catherine, Duchess of Cambridge attends day 4 of the Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in Cheltenham, England. (Photo by Danny Martindale/Getty Images)

  • The Cheltenham Festival - Day 4

    CHELTENHAM, ENGLAND - MARCH 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend day 4 of the Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in Cheltenham, England. (Photo by Danny Martindale/Getty Images)