If you haven't already , you really must watch Valley of the Dolls, it's unintentionally hilarious and great for a dressed up night in with a group of mates. You should equip yourself with a bottle and a homemade bingo board so that you can cross off a box everytime you hear "Sparkle Neely, Sparkle!"
I read the Jacqueline Susann novel a couple of summers back during a lazy week in Devon with my best friend and recommend it; nothing life changing, but perfectly trashy all the same.
Watch the trailer below and you should get an idea of how fantastically camp the film is. Dionne Warwick's theme tune is perfectly self pitying and the interiors and costumes don't hurt, either.