Live from the set of Suicide Squad, actress Margot Robbie shared a photo of herself indulging in a little expertly-decorated birthday cake...and staring into her own soul.

Well, staring at comics that feature Harley Quinn, anyway. And doing so while dressed as Harley, whom Robbie plays in the film.

You can check the photo out below.

Harley's cake - thank you squad! A photo posted by @margotrobbie on Jul 3, 2015 at 3:13pm PDT

Robbie stars alongside Will Smith and an army of other A-listers in a film based on the long-running DC Comics series, and directed by Fury's David Ayer.

The film is due out next August. Check out our comic book movie calendar for more information on the burgeoning DC Cinematic Universe.