Troubled singer Britney Spears caused further worry to fans when she struggled through a raunchy pole dance routine looking dishevelled and disorientated. Scantily-clad Britney wore revealing leather hot pants and torn fishnets as she tried to strut her stuff - but she moved ungraciously as she clung on to the pole. The images fuel fears that the singer is spiralling out of control. She tried to give the dance some of her notorious attitude, but no matter how hard she tried she just looked shy and embarrassed. Britney looked a sad sight with her make-up smeared and her long dark hair hanging lifelessly across her face during the bizarre routine. At one point during the filming the 25-year-old stared vacantly into the camera while she clutched her Yorkie puppie. An onlooker said that the star sobbed hysterically at the end of filming. The shocking pictures were taken during a shambolic video shoot in LA, just hours after her disastrous interview with OK! magazine. Britney was in such a state on that occasion that she vomited on a Gucci dress, according to reports. The editor of OK! magazine has said her staff were left "shocked and saddened" by the star's latest behaviour. Britney left a bill of more than £10,000 after walking away with designer goods and leaving a number of items damaged. The singer also let her Yorkshire terrier defecate on a £3,350 Zac Posen gown. It's not the first time the star has been seen in a mess in recent times - while visiting a bar in West Hollywood recently, the dazed looking star was seen with food smeared across her face.