Eddie Redmayne has revealed his most embarrassing on set moment occurred while filming Fantastic Beasts And Where To Find Them - which premiered in 2016.

The 41-year-old actor plays magizoologist Newt Scamander in the Harry Potter spin-off franchise.

In one scene from the first movie, Eddie explained he was filming a scene where his character must perform a mating dance in an effort to distract a magical creature called an Erumpent, which slightly resembles a rhino.

However, he revealed that disaster struck while performing some of the moves, and his trousers ripped open.

Speaking to British Vogue, he said: 'It was humiliating anyway, but I managed to rip my trousers. 

'My a*** was on show for everyone to see on a night shoot in the middle of Watford.'

It comes after Eddie revealed that he had to take classes to learn how to handle a wand and pull off magic tricks when he joined the franchise.

In an interview with Vanity Fair last year, he said: 'When we started on the first Fantastic Beasts, there were things that were very stressful.

'Like, having a wand is like your childhood dream, but suddenly you’re presented with this thing and you get complete stage fright. I don’t have a clue what to do with it.'

He added: 'So wand school was created, and apparating school. But then you became very blasé about that stuff and about the kind of everydayness of having a wand.'

Eddie went on: 'But then, the joy of those films was getting to watch new actors come in and be presented with their wand and watching the inner kid just reveal itself, from everyone and anyone, however extraordinary the actor.'

Eddie has also spokem about the filming process on Fantastic Beasts which featured lots of CGI and visual effects to the Radio Times.

'One of the things that I learnt on Fantastic Beasts is that it's sort of your responsibility as one of the lead actors to engage in the process,' he said. 

'A lot of my interaction was with imaginary creatures. At its best [film-making] is the intimacy of collaboration. So when you're doing a scene with a Niffler, one of the magical animals, I don't just want a tennis ball there.'

'I want the VFX [visual effects] artist [performing] in front of me.'