Summer girl:Scarlett Johansson sports a demure floral summer dress at Comic-Con.

She’s become a popular fixture in the Marvel Comics universe with her sultry turn as Avenger Natasha Romanoff, aka Black Widow.

But Scarlett Johansson appeared to be more in the mood for floral print than the figure-hugging rubber outfit favoured by her superhero alter-ego.

Breaking from her secret agent persona, the 28-year-old actress donned a demure brightly coloured frock for a promotional appearance for Captain America: The Winter Soldier at Comic Con in San Diego, California on Saturday.

Summer girl: Scarlett Johansson arrived to the Marvel Comics presentation at Comic Con in San Diego wearing a floral print dress, on Saturday

The Lost In Translation star wore smoky eye make-up as she wore her ombre tresses in a pile of curls down her toned shoulders.

Extending her petite 5ft3 frame, Scarlett wore tall stilettos pumps as she posed next to her strapping 6ft Captain America star Chris Evans.

The pair clearly share a sweet chemistry as they cuddled up to one another on the arrivals carpet.

Curves and all: The 28-year-old showed off her superhero figure in her form-fitting garment

Super duo: Scarlett posed with Captain America co-star Chris Evans

According to Seattle PI, Evans spoke candidly about what it was like to kiss his gorgeous co-star at the Marvel presentation at Comic Con.

The 32-year-old claimed that his onscreen passion with Scarlett was more like kissing his sister than titillating foreplay.

The titular star of the Captain America series explained that he’s known Johansson for more than a decade since they co-starred in the 2002 film Perfect Score.

‘She was a kid. She was like 16 or 17 years old,’ Evans explained.