On Friday, the 30-year-old - who is the daughter of Demi Moore and Bruce Willis - posted a throwback video on Instagram of her as a child attending an event with her dad.

Axar.az reports that in the clip, the Die Hard actor is holding Tallulah during a red-carpet interview. As he’s talking, she’s rubbing his head and playing with his ear.

Joking about the moment, she revealed that she was recently diagnosed with autism. “Tell me you're autistic without telling me you're autistic” she captioned the post.

In the comments section, one follower praised her for sharing the video and asked if she was diagnosed as a child.

“This is the first time I’ve ever publicly shared my diagnosis. Found out this summer and it’s changed my life.” Tallulah replied before calling herself “neurospicy” in another comment.