The film Avengers: Infinity War is schedule to hit theaters on May 3. And on Monday, cast members of the Marvel superhero movie dressed to the nines for the Los Angeles premiere at El Capitan Theatre. Scarlett Johansson, who stunned in a strapless glittering gown, brought her boyfriend Colin Jost to the premiere - marking their first red carpet together as a couple. Scarlett, who plays the Black Widow in the successful franchise, glittered in a sparkling embellished dress. The 33-year-old actress flaunted a hint of cleavage in the low-cut strapless number, complete with a black fabric belt highlighting her slim waist.