Paul Mescal can't wipe the smile off his face as he poses with his proud siblings Nell and Donnacha in rare snap after the UK premiere of his new film Gladiator II

Paul Mescal couldn't wipe the smile off his face as he posed with his proud siblings Nell and Donnacha after gracing the carpet at the Gladiator II film premiere on Wednesday.

The leading star, 28, looked happier than ever as he relaxed with his nearest and dearest after the very star-studded red carpet.

The younger sister of the Hollywood heartthrob, 21, posted a sweet rare Instagram snap with her older brothers shortly after supporting Paul at his premiere.

Nell was a vision in the shimmery strapless number, sporting classy brown stilettos.

She looked every inch of the proud sister as she supported Paul in his eagerly-anticipated leading role for the second instalment of the period action movie, starring alongside Pedro Pascal , Denzel Washington and Joseph Quinn.

Gladiator II will hit both US and UK theatres on November 22 - where Oscar nominee Paul 's character battles three-time Emmy nominee Pedro 's Roman general-turned-gladiator, man-eating baboons, and a rhino-riding warrior.

Paul took over the role of Lucius Verus (Spencer Treat Clark), the grown-up nephew of the late Roman Emperor Commodus (Joaquin Phoenix) who idolized the late general-turned-slave-turned-gladiator Maximus Decimus Meridius (Russell Crowe).

Gladiator II - which has men fighting atop giant boats in shark-infested waters - will also feature Matt Lucas, Fred Hecnhinger, May Calamawy, Lior Raz, Peter Mensah, and Tim McInnerny.

'Working on this film was one of the standout moments of my life to date,' Paul gushed in the pre-taped introduction.

'Getting to go to work every day with Sir Ridley Scott behind the camera is a good day to work in any context.'

Speaking candidly earlier this summer, Nell insisted her success in the music industry is purely down to her hard work and not because of her famous brother.

The songwriter has told in a candid new interview how her brother's fame has impacted her.

The Normal People alum is one of the most sought after actors of the past five years - after soaring to fame in Normal People and starring in Gladiator II.

Nell has now said that when she was first signed for her music and came over to the UK she was encouraged to drop her surname so the association with Paul was lost.

She told The Sunday Times : 'When I first signed and came over to the UK, a lot of people said, 'Do you want to change your name to just Nell?'

'No. I love my name. A lot of people will assume that any room I get into is because of one certain thing [her brother], but it's not true and that's something I've come to terms with. I know I am where I am because of how hard I work.'

She added of Paul's fame: 'It's strange seeing so many people fall in love with him, but of course because he's such a great guy. It's lovely to see him work so hard and for it to pay off.'

The siblings and their brother Donnacha's parents are Dearbhla, a Gardí, and Paul, a schoolteacher - both from Maynooth in County Kildare.

In the interview she added that the siblings do mostly normal things together like movie and takeaway nights and that as a family they are 'genuinely best friends'.

According to The Line Of Best Fit , Nell claimed in January: 'Can I Miss It For A Minute?' is a concept EP written about growing up, moving away, friendship breakups, and trying to navigate between current emotions and negative memories.

'Each song tells a part of the same story with a beginning, middle and end. Some songs are written in the moment and some are written in retrospect.

'It talks about my life and how I deal with experiences that have shaped me. Most importantly I think it's about moving on from things that used to have a hold on me.'