Hollywood A-listers and British celebrities arrived at the Windsor Castle Saturday afternoon to witness the wedding of Prince Harry and US Actress Meghan Markle.

Among those who arrived early at the castle grounds were American media mogul Oprah Winfrey and English singer James Blunt.

American actor George Clooney and his wife Amal, as well as soccer star David Beckham and his fashion designer wife Victoria, were among the power couples seen at the event.

The prince's childhood friend Tom Inskip was also in attendance. Inskip was often described as Prince Harry's "wingman." Prince Harry and Markle were both present during Inskip's wedding in Jamaica last year.

Prince Harry's ex-girlfriend Chelsy Davy was spotted among the wedding guests who strutted to the chapel for the ceremony.

The Middleton family, Prince William's in-laws, were also invited to the wedding.

A host of stars are expected to attend the nuptials in the picturesque British town of Windsor, Queen Elizabeth's favorite weekend home and the oldest and largest occupied castle in the world.

Here are some of the couple's high-profile guests:

Oprah Winfrey arrives at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry. Ian West, Reuters.

David and Victoria Beckham arrive to the wedding of Britain's Prince Harry to Meghan Markle in Windsor, Britain. Toby Melville, Reuters.

US actor George Clooney (R) and his wife British lawyer Amal Clooney (L) arrive for the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor. Odd Andersen, Reuters.

Singer James Blunt arrives with guests to the wedding of Prince Harry and Meghan Markle in Windsor, Britain. Toby Melville, Reuters.

Tom Inskip arrives at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry in Windsor, Britain, May 19, 2018. Ian West, Reuters.

Chelsy Davy arrives with guests to the wedding of Prince Harry and Meghan Markle in Windsor, Britain. Toby Melville, Reuters.

Pippa Middleton and her husband James Matthews arrive for the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor, Britain. Odd Andersen, Reuters.

Carol Middleton and Michael Francis Middleton arrive at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry. Ian West, Reuters.