He once admitted to being 400lbs but it seems that John Goodman is now a changed, and much thinner, man.

The 63-year-old actor cut a slim figure as he attended the Trumbo film premiere in London on Thursday night.

It appears that John has lost a considerable amount of weight in recent months and was a shadow of his former self, looking almost unrecognisable as he took to the red carpet with co-stars Dame Helen Mirren and Bryan Cranston.

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Almost unrecognisable: John Goodman has lost a considerable amount of weight in recent months. Pictured on Thursday at the Trumbo film premiere (left) and in November 2014 (right)

The Monuments Men star appears to be at his slimmest ever and he's clearly had a lifestyle overhaul over the past year.

He was looking considerably heavier at The Gambler premiere last November.

John has been open about his battle with his weight and following a considerable weight loss in 2010 he explained how he had once seen his weight creep up to over 28 stone.

In demand: The trio showed off their smart outfits as they posed for pictures on the red carpet

Thinner man but still a big star: The threesome posed for cameras outside the cinema

Suited and booted: John wore a pin-striped suit and a spotty tie to the screening of his latest flick

When asked about his heaviest weight, he told David Letterman: 'Plenty ... [I was] pushing 400 ... Somewhere up around there.'

He added that trying to stay in shape was an ongoing battle.

John said: 'I'm not going to look like Paris Hilton or anything like that. It's going to be an ongoing process for the rest of my life.'

Lean back: The funny man struck an awkward pose with his three co-stars

The whole gang: John, Adewale, festival director Clare Stewart, Helen, Bryan and guest

No wonder he's smiling: John beamed for the cameras as arrived on the red carpet at the premiere

Five years on and it appears that John has finally conquered his battle with the bulge and appeared in great spirits as he arrived at Leicester Square with his co-stars on Thursday.

John plays the role of Hollywood producer Frank King in the flick, which tells the true story of Oscar-winner Dalton Trumbo (Bryan Cranston).

Screenwriter Trumbo and a number of his friends become blacklisted for their Communist political beliefs and are ultimately sent to prison after battling both the Government and Hollywood studio bosses.

After being released Dalton struggles to find work and is forced to churn out screenplays under pseudonyms for King.

King pin: John plays the role of Hollywood Producer Frank King in Trumbo