"They've been a couple since early March but kept things low key. However, all their friends know about the relationship. They're really into each other," a source revealed to the Sun last month.
The pair have been seen out and about on several occasions.
Earlier this year, they were seen leaving a private jet alongside Chris Hemsworth, Elsa Pataky and Matt Damon in Sydney.
The film stars are Down Under shooting scenes for Waititi's Thor: Love and Thunder film, as is Russell Crowe, who was seen on a bike ride with Ora last week.
Fans also saw Ora and Waititi out at Big Poppas bar on Sydney's Oxford St, with one telling DeuxMoi, a celebrity gossip account on Instagram, that they were "all over each other".
The couple were first pictured together in March looking cosy at a fancy dress party which Chris Hemsworth threw for his childhood friend Aaron Grist when Idris Elba's wife Sabrina shared a photo of them in 80s costumes.