Anne Hathaway looks radiant in a sweeping feathered gown as she joins Meryl Streep at the Shanghai premiere of The Devil Wears Prada 2 - amid speculation about her youthful looks

Film and fashion took centre stage on Friday as Anne Hathaway and Meryl Streep attended the Shanghai premiere of their eagerly anticipated new film, The Devil Wears Prada 2. 

Both were in attendance as China's largest city hosted the latest red carpet event on behalf of the forthcoming sequel, which launches in cinemas across the United Kingdom and United States from May 1. 

Looking radiant in a sweeping feathered evening gown and perspex heels, Hathaway, 43, inevitably commanded attention as she addressed the audience after posing for a series of photos alongside her glamorous co-star, 76.

Streep claimed her own share of the spotlight in a tasteful blue satin dress, accessorised with distinctive pieces from CINDY CHAO jewellery, and heels from Alexandre Birman.

Hathaway may well have been relieved that much of the attention centred on the film, rather than her increasingly youthful appearance - with unwanted speculation trailing the actress from one promotional commitment to another over recent months. 

Despite never confirming any cosmetic procedures, her youthful appearance has consistently led to speculation from fans and plastic surgeons.

Speculation reached fever pitch after fans claimed she looked like she was in her twenties rather than early forties, with many suggesting she'd had 'tweakments' such as Botox, fillers or a 'ponytail lift.'

Hathaway has never said anything to suggest she has gone under the knife, though in 2008 she stated she felt pressure to be 'cookie-cutter beautiful' when she was younger and had even considered a nose job.

Two years later the actress insisted she would never get Botox because she liked her face to 'reflect a personality' and wanted to keep the same smile she had as a child.

She has continuously declined to speak about any procedures she has or has not had done, previously insisting to Vogue France that asking about surgery is 'an extremely intimate question'.

But Hathaway added that she has no judgement towards those that do opt for cosmetic surgery, stating: 'Whatever means they find to not live crushed by shame or a lack of self-confidence... I say bravo.'

Asked about her youthful looks again during a recent interview with Harper's Bazaar, the Princess Diaries star insisted she did not 'discuss medical information'.

She did credit her radiant complexion to her decision to stop drinking alcohol and using products from Shiseido, for which she is a brand ambassador.

But the Hollywood icon confessed to the publication that despite her enviable looks and figure, she still has days of struggling with her body.

'Some days you look in the mirror and you're just like, "Not bad,"' she said. 'And some days you look in the mirror and you're like, "What?" And I was having a "What?" day.'

'And you know how you have your aspirational swimsuit that you keep around, just in case you have a good day? And then you have your swimsuit that's got you no matter what? I accidentally packed the aspirational swimsuit.

'Which I then had to wear on a "What?" day. So, I'm ready to have this great day with my family. And I am going to be in front of strangers, and people have phones. And all of the things.

'But my family is waiting for me. And I looked and I just went, "What?" And then I looked again and I said, "You are 43." And looking at a 43-year-old body, I was like, "Nice."

'When I was expecting to see something that I am not, I felt insecure. But when I actually looked at what it actually is, I was okay with it. I think you realize that worry should be reserved for the really big stuff.'

And despite still having those brief moments of insecurity, Anne said that she's enjoying being in her 40s and finds that her happiness has only increased as she's gotten older.

She said: 'I think that very often, conversations about aging presume that the first part of life is the happiest and the most fulfilling, and I don't necessarily think that's true. I wasn't expecting to find another gear at 40.'

The Devil Wears Prada 2 reunites Hathaway, Streep, Emily Blunt and Stanley Tucci as they dive back into the cutthroat world of high fashion - but this time with a modern twist.

Early plotlines suggest Streep's fashion editor Miranda is grappling with the decline of traditional print media while facing off against Blunt's Emily Charlton, now a powerful executive controlling crucial advertising dollars.

The sequel will also introduce a host of new faces, including Kenneth Branagh, Lucy Liu and Justin Theroux.

And with the original 2006 film raking in over $300 million worldwide and becoming a bona fide cult classic, fans are buzzing to see the sequel bring back the glamour - and a whole new dose of high-fashion drama.