The annals of rock 'n' roll are gilded with tales of heated sibling rivalry. Oasis's Gallagher brothers have famously come to blows, while there was no love lost between the Kinks' Davies boys. Now, sister-act the Veronicas have turned to pugilism to settle a few differences.

"Recently we've taken a liking to boxing," Lisa Origliasso, one half of the Veronicas, tells "When you're on the road for so long, you do have a lot of energy which you can't quite get out of your system. Ever since we started with boxing, we've actually been a lot more in harmony with one another."

The past year has presented many occasions for the identical twin sisters to wind one another up, having trekked across the U.S. on numerous occasions with the likes of the Jonas Brothers, Hanson and Natasha Bedingfield, and stepping out for their own promo visits.

Veronicas sparing sessions are all in good fun and no blood is spilt, yet.

"At times, I would say we're a little more like the Gallagher brothers than the Jonas Brothers, we don't quite get along," quips Lisa. "Being two girls on the road together, if we get frustrated we do tend to take that out on each other because we've always got each other there. We're learning to control that energy."

The Australian duo have had a different type of hit on their hand with "Untouched" (EngineRoom/Sire), which has enjoyed a fine run into the top 20 of the Billboard Hot 100. The twins have just embarked on their "Revenge Is Sweeter" tour of Australia and New Zealand, beginning Feb. 13 at the Newcastle Entertainment Centre. No doubt, the gloves will be packed.

For more on the Veronicas, turn to the new issue of Billboard magazine.