Royal tea party with 'The Crown' stars Vanessa Kirby and Helena Bonham Carter up for auction

Helena Bonham Carter and Vanessa Kirby have both starred as Princess Margaret in 'The Crown'. (Photo by Willy Sanjuan/Invision/AP. Chris Delmas/AFP via Getty Images)

The Crown fans have the opportunity to snap up a special Royal Tea Party experience with two cast members as part of a charity auction.

War Child is offering the highest bidder the chance to have a sit down tea with Princess Margaret stars Helena Bonham Carter and Vanessa Kirby in order to raise money for young people living in conflict zones, whose situations have worsened due to the coronavirus.

The winner will be able to bring along a friend for afternoon tea with the stars at a London location.

Read more: The Crown will have sixth and final series

Kirby, who is a Global Ambassador for the charity, said she was "honoured" to be able to support the cause.

Helena Bonham Carter as Princess Margaret in 'The Crown'. (Netflix/Sophie Mutevelian)

The 32-year-old played the monarch's sister in the historical drama for two series before Bonham Carter, 54, took over for season three. She's set to reprise her role in the fourth instalment before Lesley Manville steps in for seasons five and six.

The six-week campaign from War Child UK is aiming to raise £300,000 through the Crowdfunder for the relief effort.

A wealth of experiences involving other famous faces are available through prize draw or to bid on and buy instantly, with details to be found here.

Edward Christopher Sheeran, English singer, songwriter, guitarist, record producer, and actor, performs during the first day of Sziget Festival in Budapest. His concert is the biggest sold out in the whole history of this festival. (Photo by Luigi Rizzo/Pacific Press/LightRocket via Getty Images)

They include a signed guitar with a personal message from Ed Sheeran, who is also offering up a meet and greet at a future UK show.

Meanwhile, a copy of Game of Thrones book ‘Fire and Blood’ signed by Daenerys Targaryen star Emilia Clarke is also available to buy.

More prizes are expected to be unveiled half-way through the campaign, which ends on 1 September.