Days after opening up about the real reason behind her break-up with Liam Hemsworth in 2013, Miley Cyrus has shown just how loved-up her and her fiancé are on the red carpet for the premiere of Hemsworth's brother Chris' new film, Thor: Ragnarok.

Last night, the 24-year-old brought a splash of colour to the premiere, dressed in a floral-print dress with a pearl studded handbag and flowers in her hair, while her 27-year-old husband-to-be kept it understated in a black tuxedo.

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The 'Wrecking Ball' hitmaker also wore teal coloured mascara for the occasion at the El Capitan theater in Hollywood because, well, she's Miley.

Cuddling up on the red carpet together, the couple - who reunited last year after three years apart - looked smitten, gazing into each other's eyes, with Miley frequently placing an affectionate hand on Liam's shoulder during their red carpet appearance.

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Meanwhile, leading man Chris Hemsworth dressed in a cobalt blue suit and posed alongside his wife Elsa Pataky, who he recently revealed had to make some serious sacrifices for their relationship over the years.

'In terms of work, she's certainly given up more than I have,' he recently told GQ Australia. 'She'd like me to step back and be at home with the kids more and, of course, I want that too. But I feel like I'm at this crucial point in my career - I've just got to set up for longevity or I'll slip off.'

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In an interview with E! earlier this week, the 34-year-old also opened up about his children's blazé attitude towards his A-list career.

Talking about bringing his brood on set with him, the actor said: 'They were like, "This is so boring. We thought you fought monsters for a living and you don't".'

Well, if it means anything - we're impressed, Chris.