Harry Potter star James Phelps likes to run up huge hotel bills and charge them to his twin brother

'Harry Potter' star James Phelps likes to run up massive hotel room and bar bills and put them on his twin brother Oliver's credit card.

The siblings starred as the hilarious Fred and George Weasley in the blockbuster wizarding franchise, who were known for their pranks, and they are just as mischievous in real life.

James cheekily confessed to the supplement Travel: "For me the biggest perk of being a twin is being able to order food and drink in a hotel, and charge it back to my brother’s room.

"I usually find a place to watch him discover what I’ve done whenever he checks out."

Sharing another bonus to being famous, he added: "In Paris we were both dying to see the Louvre but were gutted because it was closed on our only day off. Then at 9am we had a knock on our hotel room. Somehow someone had managed to open the Louvre just for us."

Meanwhile, Potter fans visiting London were in for a treat, as Aunt Marge drifted across the London Skyline in a scene out of the wizarding world.

The giant inflatable - which weighs a whopping 95kgs and had a circumference of 11.7m - was erected in front of Tower Bridge to mark the 20th anniversary of 'Harry Potter and the Prisoner of Azkaban'.

Warner Bros. Studio Tour London - The Making of Harry Potter - has a new feature, ‘Return to Azkaban’, which is based on the third film.

It's open until September 4, and includes brand new sets including the Divination classroom and new section of the Defence Against the Dark Arts classroom on display for the first time ever.