14/08/2014 12:45 BST | Updated 20/05/2015 06:12 BST

Jessica Chastain Is Unrecognisable In Sheer Black Dress For Italian Film Festival

Jessica Chastain took one massive style step away from her usual prim and proper look and opted for a sleek sexy (and rather revealing number) as she hit the Ischia Global Festival in Italy with boyfriend Gian Luca Passi de Preposulo.

The 37-year-old looked decidedly different in a clingy black number, made good with sheer panelling and teamed with simple black Louboutin heels.

With her hair in loose curls about her shoulders, the actress had heads turning as she arrived at the film festival with her Italian beau by her side.

Letting her sultry frock do all the talking the star steered well clear of accessories on Sunday night. We approve.

Gian Luca paired himself perfectly with Jessica as they walked hand in hand to the venue dressed in a mix and match grey linen suit.

The couple were also spotted the night before in much more, er, colourful numbers.

The Zero Dark Thirty star wore a very striking floral dress as she headed out to a gala dinner with Gian Luca. Chastain topped off the look with gold chandelier earrings and strappy gold platform pumps.

Making sure to match his girlf, Gian coordinated in a bright red suit jacket over a red and white pinstriped dress shirt, teamed with white trousers and brown leather loafers.

We're not sure about you but we think we prefer their other look.

LOVE JESSICA? See more in her style file below.

MORE! Jessica Chastain may be one of our favourite red carpet sirens, but take a look at which other stars make the grade...

Five Red Carpet Screen Sirens: Jessica Chastain