Sia's North American tour is one of the hot tickets of 2008 and the shows are selling fast.

But don't despair, whilst tickets to her shows in San Francisco, Boston and New York are already sold out, there is still a chance for you to attend these dates, along with her other North American shows.

We are running a fantastic competition for you and a friend to catch Sia at a venue near you.

Just text SIA to 66937 and not only will you be entered into the super-brilliant competition to win two tickets to the show taking place nearest to your town, but you'll also get a free Electric Bird ringtone - so even when you're on the go, you can listen to a little bit of Sia.

Good luck!

Please note: This competition is only open to US residents.