According to Kenison Tejada, a Honolulu fire captain, the home was beyond saving when firemen arrived on the scene.

"When we arrived the house was fully engulfed. It was a complete loss," he said.

The fire department received an alarm call at 6.43am and arrived six minutes later.

"We stopped the fire from spreading. It took us maybe 15 to 20 minutes to knock down the main body of fire.

"The only thing standing was the roof and a couple of the interior walls. Most of the contents had been destroyed. The home was pretty much destroyed and uninhabitable."

Morgan Janus, a neighbour who lives opposite, told the Honolulu Advertiser newspaper: "I woke up to my dogs barking. There were loud popping sounds, like something electrical."

Lilly, 27, who plays Kate in the cult TV drama, is dating co-star Dominic Monaghan.

The British actor, who starred in the 'Lord of the Rings' trilogy, visited the house yesterday to inspect the damage but refused to comment.