Brooklyn Beckham supported his new girlfriend Chloe Grace Mortez at the 'If I Stay' premiere last night 20th of August 2014

Brooklyn - who is thought to have been dating Chloe for the past three months - looked dashing in a navy suit which he teamed with a pair of white trainers.

Chloe looked elegant in a Schiaparelli dress and a pair of Christian Louboutin shoes as she was joined by her co-stars Jamie Blackley and Liana Liberato on the red carpet.

The drama movie tells the story of Chloe's character Mia Hall who goes through an out-of-body experience in which she has to make a tough decision after a car crash puts her in a coma.

Brooklyn's attendance at the film premiere comes after he and Chloe both went to the Teen Choice Awards together earlier this month.

While their joint attendance appeared to confirm they were in a relationship, the pair didn't walk the blue carpet together as the model skipped that part of the event.

Chloe and Brooklyn first sparked rumours they were dating earlier this month after they were spotted skateboarding together on numerous occasions.