The TV presenter, who was introducing the latest line-up to the public, completed her ensemble with a pair of black and gold Jimmy Choo heels.
Priced at £423, the designer ‘Open Back Midi Dress’ by Rebecca Vallance has proven to be popular.
Taking to Instagram Willis shared a snap of herself with her followers before the big night kicked off.
“Let’s all hit the squash!,” she wrote.
Social media users were quick to comment on her look for the night.
“Stunning dress, Emma,” one Instagram user wrote.
“Love the dress,” another wrote.
“Dress was fabulous tonight - love, love it,” another posted.
And Twitter users loved her outfit choice too: