Saoirse Ronan & Antonio Banderas: 'Justin' London Premiere!

Saoirse Ronan hits the red carpet at the premiere of her new animated film Justin and the Knights of Valour on Sunday (September 8) at the Mayfair Hotel in London, England.

The 19-year-old actress was joined at the event by her co-stars Antonio Banderas and Tamsin Egerton.

PHOTOS: Check out the latest pics of Saoirse Ronan

Justin and the Knights of Valour is about a young boy who becomes a man as he embarks on a quest to become a knight. The film is set to be released in the U.K. on September 13, but it does not have a U.S. release date at this time.

FYI: Saoirse is wearing a Mary Katrantzou dress.

15+ pictures inside of Saoirse Ronan and Antonio Banderas at the premiere…