Christina Hendricks has revealed she was the hand model for the iconic American Beauty movie poster.

The 1999 film was advertised with a poster featuring a woman's hand holding a rose on a naked stomach.

And in a post on Instagram on Thursday, the Mad Men actress told her fans that hers was the hand in the snap.

“Fun fact…. wait for it…I used to be a model and sometimes a hand model…. this is my hand and another model’s stomach….proud to be a part of this film in ANY WAY!!! #americanbeauty,” she wrote alongside the poster.

Christina's revelation was met with shock from many of her famous friends, with her Good Girls co-star Retta commenting: "Staaahhhppp".

"This is important. How come I didn’t know this?" her former Mad Men co-star January Jones asked, while Busy Philipps wrote: "Wait…. What!?”

Meanwhile, Elle Fanning added: "I'M SHOOK!!!!!!”

American Beauty, which starred Kevin Spacey, Annette Bening, and Mena Suvari, won Best Picture at the Oscars in 2000, with Kevin also winning the gong for Best Actor.