Natalie Imbruglia has joined Hollywood's latest health craze.

The 'Torn' singer - who recently moved to Los Angeles to pursue her acting career - is a regular member at Barry's Bootcamp, the class dubbed "Hollywood's hottest workout", in order to maintain her stunning figure.

The Australian beauty - who was one of the star performers at the White Nights of St Petersburg festival over the weekend - told BANG Showbiz: "I do a lot of hiking and I've discovered Barry's Bootcamp and oh my god it's amazing.

"I did the West Hollywood one. I train with David he's hardcore and Derek, they're both great.

"It's nice and dark so you don't have to worry about anyone looking at you and they play really loud music with cross-training, sprints and weights, so I do that."

Jessica Alba and Amanda Seyfried are among the number of stars taking the "1000 calories an hour" classes and Kim Kardashian was so impressed she even featured it on her reality show.

As well as Barry's Bootcamp, Natalie, 37, also likes to go hiking as it's a fun way to burn calories.

She added: "I do like to exercise - Hollywood's a great place for hiking. I've done Tracy Underwood method in the past, I love dancing so. And hiking, I just mix it up."

The White Nights of St Petersburg festival took place in St Petersburg from July 6 to July 8 and as well as star performers such as Natalie, Anastacia, David Hasselhoff, Tony Hadley and Michael Bolton, there was an international singing contest which was judged by Paula Abdul and won by American Tyler Conti.

For more information on the festival go to http://wnfestival.com/.