Cara Delevingne was tattooed by Margot Robbie.

The stunning supermodel-turned-actress has shared a photo of her 'Suicide Squad' co-star giving her an inking on the bottom of her foot on her Instagram account.

The picture shows Australian babe Margot, 25, dressed as her character Harley Quinn in the upcoming Warner Bros. superhero movie.

The special tattoo commemorated the end of filming the blockbuster, which also stars Will Smith, Jared Leto and Jai Courtney.

Cara captioned the picture: ''It's on @suicidesquadmovie #harleystattooparlour (sic)''

In another snap, Cara is seen tattooing another member of the cast while Margot lurks in the background.

The 23-year-old beauty recently revealed she has turned her back on modelling as it made her ''feel a bit hollow''.

She said: ''It didn't make me grow at all as a human being. And I kind of forgot how young I was. I felt so old.

''I was, like, fight and flight for months. Just constantly on edge. It is a mental thing as well because if you hate yourself and your body and the way you look, it just gets worse and worse.''