Margot Robbie Rocks 'Suicide Squad' Costume, Celebrates B-Day with Harley Quinn Cake

by Zach Seemayer 11:31 PM PDT, July 05, 2015

Suicide Squad is definitely shaping up to be one of the most anticipated movies in years, and a big part of that is the constant tidbits and teases that are keeping the fans fascinated.

On Friday, Margot Robbie posted a photo to Instagram celebrating her birthday. The actress was decked out in her awesome Harley Quinn costume, showing off her fun hair color and bold makeup.

WATCH: Margot Robbie Is Delightfully Frightening as Harley Quinn on Suicide Squad Set

Robbie, who turned 25 on July 2, got one of the coolest birthday cakes of all time, which was covered in fondant-formed comic books with Harley Quinn covers.

Harley's cake - thank you squad!

A photo posted by @margotrobbie on

The stunning star captioned the photo: "Harley's cake - thank you squad!"

WATCH: Jared Leto Is Terrifying in Full Costume on Suicide Squad

This is just the latest glimpse inside the production of Suicide Squad after director David Ayer posted several photos of Jared Leto as The Joker, and a number of cast pics.

NEWS: Suicide Squad Assembled -- David Ayer Tweets First Pic of Cast in Full Costume

Suicide Squad won't be released until August 2016, but with all the set photos and leaks it's getting harder and harder to wait for the highly anticipated movie to hit the big screen. 

For another look at how truly badass Robbie looks as Harley Quinn in Suicide Squad, check out the video below!