It's the raunchiest movie in years but and its leading lady didn't want to forget her months working on it.
So, Dakota Johnson decided to help herself to a BDSM item when she and Jamie Dornan completed their work.
The star looked stunning in a red Saint Laurent gown as she arrived for her big Oscars role.
She said: "I wanted to keep something from the film, I wanted to keep a prop so I decided to take a flogger with me."
Laughing, she refused to explain what it was, but in fact, it is an erotic leather whip that can be used to whip others.
You get the gist.
And despite being one of the most sought after actresses, Dakota, 20, is single and so brought a more unusual date.
"I brought my mum with me tonight, she is my date."
