Scarlett Johansson dazzles in thigh split gown at Avengers Endgame premiere (Image: Getty Images)

Scarlett Johansson, who plays Black Widow in the Marvel film franchise, looked incredible at the Los Angeles premiere of Avengers Endgame last night.

The American actress, 34, dazzled in a sparkly strapless dress when she arrived on the star-studded purple carpet at the Californian event.

The twice-married star attended the film event with American comedian Colin Jost, 36, who looked dapper in a dark grey suit.

Linking her arm around her beau, the pair put on a cosy display for the photographers before heading into the venue to watch the film.

When the mother-of-one posed for pictures she revealed her show-stopping dress had an almost backless design which highlighted her famous figure and a large rose tattoo on her back.

Also at the premiere last night were Marvel stars Gwyneth Paltrow, Robert Downey Jr, Brie Larson and Chris Hemsworth as well as his brother Liam Hemsworth and new wife Miley Cyrus.

The former Disney actress wowed in a cutout velvet dress with diamante details at the bust.