Moretz, 19, confirmed they were dating in May on Bravo’s Watch What Happens Live, with Andy Cohen.
The couple were first rumoured to be dating in 2014 after they were spotted together at Paris Fashion Week.
Speaking to Teen Vogue two years ago, Moretz wouldn't confirm the relationship, instead revealing what she likes about Beckham.
'What I find really interesting about Brooklyn – and what I really love about that kid – is that he is passionate about what he wants, which is to be a professional soccer player,' she said.
'And I enjoy someone who is on my level with the seriousness kind of thing.'
Two weeks ago, the son of Victoria and David Beckham posted a photo with friends, including Moretz, and another where he's holding the actress that is captioned, 'Keeping her safe.'
Moretz spoke to PEOPLE earlier this summer about making her long-distance relationship work.
'It's all trust and communication. You have to have a model of trust and leave it up in the air and make sure you can hope for the best,' she said. 'Make sure you're both invested, then you're good to go.'
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