The 18-year-old wore her bobbed hair in loose curls and kept her makeup to a minimum for the event, which was held the Theatre Royal on London's Drury Lane.
The actress, who plays Arya Stark in the hit HBO series Game of Thrones, couldn't have looked further away from her on-screen alter-ego as she posed outside the venue.
And, keeping it simple, she completed her look with a pair of white strappy sandals.
The petite beauty was excited ahead of the event, during which she was set to present the award for Best Scripted Comedy.
Earlier on Sunday, she tweeted her excitement ahead of the show, telling fans: 'Presenting an award at the BAFTAs tonight for scripted comedy. + the bafta goes tooooooooo..........'.
Clad in a black eye mask and with a red bandana covering most of her face, Maisie rode horseback through the Forest Fawr near Castell Coch in Cardiff.
She has also recently announced her guest role the BBC series Doctor Who to the delight of fans.
Confirming her role in March, she said: 'I'm so excited to be working on Doctor Who as it's such a big and important part of British culture.
'I can't wait to meet the cast and crew and start filming, especially as we'll be shooting not too far from my home town.'