Pop star Lily Allen is undergoing treatment for an agonising back injury. The Smile hitmaker is having sessions with a spine specialist to cure her ailment after suffering a debilitating sprain on Tuesday (08Oct13). In a post on Twitter.com, she writes, "I have put my back out, off to the osteopath." After suffering the injury, Allen's day went from bad to worse when she discovered thieves had raided her office in London and stolen a hi-tech CD player. She adds, "Oh yay, my office has been burgled. If anyone sees a pioneer cdj going up on eBay, holla (sic)."