And they still managed to look incredibly stylish while pulling faces at each other.
Pixie came to support her bestie Alexa, as well as other stylish friends Daisy Lowe and Henry Holland.
Alexa was rocking a midi-dress by Carven, a favourite label of the It-girl, who also wore a Carven dress at the GQ Men Of The Year Awards the night before.
Pixie looked casual and chic in a striped top and mini skirt, while showing off an androgynous hairstyle we wish we were brave enough to pull off!
The launch, held at Liberty London, celebrated Alexa's first venture into publishing. And with fans lining up from 2pm to catch a glimpse of the fashionista, we think it's going to be a success!