Johnny Depp, Amber Heard and her huge diamond sparkler hit the premiere of new movie 3 Days to Kill in Los Angeles last night (February 12).

The couple - who are rumoured to have got engaged last month - seemed to confirm the reports, with Amber showing off the ring, walking the red carpet with her man.

Heard opted to wear a long-sleeved black dress for the occasion, completing her look with bright red lips, while Depp looked dapper in a navy blue suit and matching hat.

The 27-year old plays FBI agent Vivi Delay in the movie and stars alongside legendary actor Kevin Costner.

Amber previously spoke about her role in an interview with E! News, where she stated: "I would rather shoot the gun and save the girl or save the guy or be hated than be cute, sweet and adorable and loved.

"It's way more fun. It's always more fun to play a badass. I always fight for those characters."

She added: "I only make a few movies a year because for every one that I take, I've said no thanks to many romantic movies where I bat my eyelashes and catch the bouquet."

3 Days to Kill is due for release in the US on February 21, while a UK date is yet to be confirmed.