Supermodel Kate Moss and her drug fiend boyfriend Pete Doherty have checked into a rehab unit together in a joint effort to battle their demons. Kate and her Babyshambles beau signed into the private Capio Nightingale Hospital in North-west London. Kate, who has previously been in rehab following last year's Cocainegate, has told friends that she is determined to support the troubled rocker's battle to beat his own drug addiction. The 27-year-old has struggled with a serious drug addiction for years and was understood to be receiving in-patient treatment at the Capio. A source tells The Sun: They arrived together and will be supporting each other. They looked very much a couple as they came in and she is clearly worried about him.