Robert Pattinson and Kristen Stewart are living together.

The 'Twilight' co-stars - who play lovers in the vampire thriller and are rumoured to be dating in real life - are reportedly sharing a Penthouse hotel suite while they film the third instalment of the film franchise in Vancouver, Canada.

The pair are believed to have rented out the entire 34th floor of the Sheraton Wall Centre Hotel at a cost of $850 a suite each night.

A source told Britain's More magazine: "They have two rooms joined by a door. They use a third suite on the floor to listen to music or watch Blu-ray movies on a large, flat screen, when they stay in after a day's shooting or on weekends."

Each lavish suite boasts two bedrooms, two bathrooms, a kitchen, a dining room and a large living room.

The source added: "They're great. Every room has floor-to-ceiling windows and large, flat screen TVs and chandeliers. The baths double as Jacuzzis. And, best of all, that floor has its own butler and security. Robert and Kristen are transported to and from the set by accessing a private elevator system in the hotel that leads to a gated and guarded garage."

While the two stars enjoy luxury surroundings in the secure building, the rest of the cast are reportedly staying in rented apartments nearby.