Scarlett Johansson stuns in a strapless red dress which shows off her huge back tattoos as she attends the Ray Gunn premiere during the BFI London Film Festival

Scarlett Johansson stunned in a strapless red dress which showed off her huge back tattoos as she attended the Ray Gunn premiere during the BFI London Film Festival on Saturday.

The actress, 41, cut a stylish figure for the event held at The Royal Festival Hall where she posed with her co-star Sam Rockwell.

Ray Gunn is an upcoming computer-animated sci-fi mystery film directed by Brad Bird.

The plot follows Raymond 'Ray' Gunn, the last human private detective, who gets drawn into a dangerous web of conspiracy and murder after being hired to investigate a case involving the volatile multimedia pop star Venus Nova – voiced by Scarlett.

Scarlett turned heads in the dress which she teamed with strappy heels to boost her height and accessorised with a simple gold necklace. 

The red number showed off the huge flower vine and lamb inking on her back which she got in 2017. 

This summer Scarlett revealed the secrets to her health and beauty routine to maintain her radiant complexion and natural beauty. 

The star said she partakes in biohacking for 'digestion' and takes a specific supplement as part of her daily routine amid her busy schedule.

She shared key details from her night routine after taking off her makeup as well as the magnesium supplement and vegan collagen she takes before bed. 

'I take magnesium at night. It helps me sleep. I feel like it's good for recovery,' she said.

The Oscar-nominated actress, who previously opened up about being 'self-conscious' due to harsh criticism about her appearance early in her career, added: 'It's good for your entire central nervous system.'

She also gushed about the benefits she has noticed when she's not sleeping after taking magnesium.

'I know that everybody is taking magnesium now. It's so helpful,' she said.

'It really makes a huge difference, especially in my digestion and my recovery, it's awesome,' the Black Widow star added.

She also said she takes vegan collagen after one of her close friends recommended it to her to make her hair 'grow thicker, faster and shinier' in spite of her dermatologist denying the claims. 

'I don't know. My dermatologist was like, 'It's everything you put on your skin, that's what counts. Anything you're taking internally, none of that is working.' 

'I'm like, 'I don't believe you. I'm going to try this out.'' 

She also opened up about her daily skincare routine in the evening.

She credited 'clean skin care standards' and 'healing, hydrating benefits' of the beauty products from her skincare brand The Outset, which she founded and launched in 2022.

'My night routine is pretty simple,' she said as she revealed she washes her face with the brand's micellar cleanser.

'I don't wear a full face of makeup every day, [just] foundation and concealer, so I don't have a full face to wash off.'

She said she also uses hydration-boosting products from her brand to complete her face routine, finishing off with a serum, a moisturizer and 'sometimes I'll put a couple of drops of boosting oil in there'. 

As for her morning routine, she said she uses the same cleanser, serum and moisturizer as she does at night. 

She adds an eye cream from her brand before doing light makeup with concealer, mascara, 'blush and a little eyeshadow, and that's it'. 

'Then I've got to run out the door. I've got two kids,' added Johansson, who shares daughter Rose, 12, with her ex-husband Romain Dauriac as well as son Cosmo, five, with her husband, Colin Jost. 

'They've got to go to school,' she added. 'I don't always have time to put makeup on. Sometimes that's a step later in the day.' 

She also opened up about her fitness routine to maintain her toned physique.