Oprah Winfrey and Idris Elba are among the first guests to arrive at the royal wedding

Actor Idris Elba and his fiancee Sabrina Dhowre arrived at the same time as Oprah, making their way into the chapel almost two hours before the ceremony is due to begin.

Other celebrities reported to be on the guest list include George and Amal Clooney and David and Victoria Beckham.

Meanwhile, Meghan's royal title was revealed on the morning of the nuptials.

Queen Elizabeth conferred a Dukedom on her grandson, Harry, 33, and after he marries Meghan, 36, the former 'Suits' actress will receive her own title, the Duchess of Sussex.

Kensington Palace announced the new title on Twitter, just hours before the pair tie the knot.

The palace said in a statement: "The Queen has today been pleased to confer a Dukedom on Prince Henry of Wales. His titles will be Duke of Sussex, Earl of Dumbarton and Baron Kilkeel.

"Prince Harry thus becomes His Royal Highness The Duke of Sussex, and Ms Meghan Markle on marriage will become Her Royal Highness The Duchess of Sussex."

Harry's father Prince Charles is set to walk Meghan down the aisle after her father, Thomas Markle, withdrew from attending the ceremony after undergoing heart surgery.

Kensington Palace previously confirmed: "Ms. Meghan Markle has asked His Royal Highness the Prince of Wales to accompany her down the aisle of the Quire of St George's Chapel on her Wedding Day. The Prince of Wales is pleased to be able to welcome Ms. Markle to The Royal Family in this way."