This is Princess Eugenie's intense fitness regime - four months before her wedding

There's just four months now until the next royal wedding of the year, and like a lot of brides, it seems that Princess Eugenie is getting in shape for the big day.

Fitness experts have guessed that the royal has lost a significant amount of weight since announcing her engagement - and has done so slowly and healthily.

So how has she done it, and what is Princess Eugenie's workout regime?

Earlier this year, the 28-year-old actually shared her fitness regime with Harper's Bazaar, revealing that she prefers an early workout.

Eugenie said, “I get up around 6:45 to start exercising by 7. I go to the park from 7 to 8. I do circuits, which I love because they're quick: burpees, squat jumps, lunges, the whole lot. It's much better, as I can't run for a long time."

It's likely that now, the Princess will be able to do all her workouts within the grounds of Kensington Palace, where she recently moved with her fiance, Jack Brooksbank.

However, the royal also shared that she's not averse to a good gym session - revealing her go-to location. She said, "Or I go with my best friend to this amazing, women-only gym called Grace Belgravia.”

Grace Belgravia is an exclusive gym available to join by invitation only, so it's no surprise that it's the perfect place to ensure Eugenie some privacy when she works out.

Princess Eugenie also shared the drinks she regularly indulges in, making sure to favour low-calorie options where possible.

She confessed, "During the day I drink everything from green tea to coffee, Diet Coke to fizzy water,

“My favourite drink is vodka soda with loads of lime. Can't beat that.”

The royal family will once again gather in St. George's Chapel, Windsor Castle, for Eugenie and Jack's upcoming wedding on 12th October.

So far, very little details about the big day have been announced, but it's thought that the Princess will choose her big sister Beatrice as her maid of honour, or chief bridesmaid.

If so, Eugenie would be following in the Duchess of Cambridge's footsteps - who also chose her sister Pippa for the honour.