She has been hot on the promo trail in support of the biggest movie of her career.

And Margot Robbie looked effortlessly chic as she joined co-star Leonardo DiCaprio and director Quentin Tarantino at the Once Upon A Time In Hollywood photocall in Rome, Italy, on Saturday.

The Suicide Squad star, 29, stunned in a black shirt dress with a red, green and blue deer pattern on it and dramatic should pads.

Wow: Margot Robbie looked effortlessly chic as she joined co-star Leonardo DiCaprio and director Quentin Tarantino at the Once Upon A Time In Hollywood photocall in Rome, Italy, on Saturday

Margot styled her blonde ombré locks into a sleek blow-dried hairdo.

The actress accessorised her ensemble with a pair of gold ruffled heeled mules and a Foundrae ring.

Margot was joined by her co-star Leonardo, who she previously starred alongside with in the 2014 film The Wolf of Wall Street.

Glamorous: The Suicide Squad star, 29, stunned in a black shirt dress with a red, green and blue deer pattern on it and dramatic should pads

Blonde bombshell: Margot styled her blonde ombré locks into a sleek blow-dried hairdo, she added a slick of glamorous make-up which included a red lipstick and bronzer

Details: The actress accessorised her ensemble with a pair of gold ruffled heeled mules and a Foundrae ring

The 44-year-old wore black jeans with a matching T-shirt, he added a brown suede jacket, white trainers and black sunglasses.

Director, Quentin, was also present and he went for a more casual look of black jeans and a blue flannel shirt, which he teamed with brown sunglasses and white trainers.

Not seen was fellow leading actor Brad Pitt – although he was present at the film’s Berlin premiere on Thursday, he appeared to be absent from proceedings in Rome.

Pals: Margot was joined by her co-star Leonardo, who she previously starred alongside with in the 2014 film The Wolf of Wall Street

Dapper: The 44-year-old wore black jeans with a matching T-shirt, he added a brown suede jacket, white trainers and black sunglasses

Casual: Director, Quentin, was also present and he went for a more casual look of black jeans and a blue flannel shirt, which he teamed with brown sunglasses and white trainers

The film is the director’s first movie not being released by Harvey Weinstein and sees Leo and Brad Pitt bring the golden age of Hollywood back to life.

Playing Rick Dalton and his stunt double Cliff Booth, the actors revisit a simpler time in Tinseltown as they transport the audience back to Los Angeles in 1969.

Margot takes on the role of Sharon Tate – the pregnant actress murdered by the Manson family in 1969.

Missing: Not seen was fellow leading actor Brad Pitt – although he was present at the film’s Berlin premiere on Thursday, he appeared to be absent from proceedings in Rome

Film: The film is the director’s first movie not being released by Harvey Weinstein and sees Leo and Brad Pitt bring the golden age of Hollywood back to life

Once Upon A Time in Hollywood also stars the likes of Lena Dunham, Maya Hawke and Margaret Qualley.

The critically acclaimed film has already been released in the US and is slated for release in the UK on August 14.

The UK premiere of the movie was held at the Odeon Luxe Leicester Square earlier this week.

During its world debut at the Cannes Film Festival in May, Once Upon A Time was heralded as Tarantino’s best film since 1994’s Pulp Fiction, which won the Palme d’Or, with stars Leo and Brad winning a seven-minute standing ovation.