Lily Allen has been boasting about trashing a dressing room.The 21-year-old singer bragged the rampage took place after her "amazing" show in Sydney, Australia, on her MySpace page, and even posted photographs of the room.She writes: "We got pretty drunk, went to see Kasabian play. We hung out with some of the other bands. Then we trashed our dressing room."Although Lily is proud of her drunken behaviour, she has been lambasted by angry parents who believe her antics set a bad example to young fans.One concerned parent said: "Although Lily obviously thinks she is living up to some rock 'n' roll ideal, the majority of her fans are young and impressionable. She should know better than to boast about wrecking a dressing room. Maybe she should concentrate on her music rather than destroy other people's property."Lily's behaviour follows her lashing out at paparazzi with a stiletto heel after last week's BRIT Awards.The 'Smile' singer, who lost out on three prizes at the ceremony, hit out at photographers after leaving Oasis' post-awards party, held at London's Cuckoo Club, with the band's wild singer Liam Gallagher.