The 26-year-old Harry Potter star has become known for her work with the United Nations and her campaign for equal rights for men and women in recent years, and Emma was recognised for her work as she attended the star-studded ceremony held at Claridge's Hotel in the English capital. The actress sported a Halloween-inspired Dior gown, featuring spooky embroidery such as bat detailing on the net skirt.

Other names who made an appearance at the annual ceremony included Keira, who was accompanied by husband James Righton as she accepted the Theatre Icon gong. The actress received praise from critics when she made her Broadway debut last year (15) as the lead character in the Roundabout Theatre Company's production of Therese Raquin.

Felicity Jones, who can soon be seen in the upcoming Star Wars spin-off Rogue One: A Star Wars Story, received the British Actress gong, while Gillian Anderson took home the Television Icon award thanks to her role opposite Jamie Dornan in hit series The Fall.

Singer Annie Lennox was recognised for her philanthropic pursuits, while veteran actress Vanessa Redgrave was presented with the British Icon award and The Night Manager star Olivia Colman won Outstanding Performance.

Meanwhile, Rosie Huntington-Whiteley was awarded the Businesswoman of the Year gong at the event, and said she was thrilled with the honour.

"This award means so much as it represents so many of my dreams coming true,” she told the audience while accepting the award.

Rosie has made a name for herself as a lingerie and nightwear designer as well as a model, creating several ranges for British high street store Marks & Spencer. She also recently launched her debut cosmetics collection for the store - Rosie for Autograph make-up.

The winners at the Harper's Bazaar Women of the Year awards are as follows:

British Actress - Felicity Jones

Theatre Icon - Keira Knightley

Inspiration - Emma Watson

Musician - Grimes

Breakthrough Designer - Grace Wales Bonner

Model - Malaika Firth

Woman of the Year - Laura Trott

Contribution to the Arts - Maggi Hambling

British Icon - Vanessa Redgrave

Fashion Icon - Donatella Versace

Television Icon - Gillian Anderson

Philanthropy - Annie Lennox

Outstanding Performance - Olivia Colman

Contribution to British Fashion - Stella Tennant

Designer - Simone Rocha

Businesswoman - Rosie Huntington-Whiteley