That young woman with Aerosmith singer Steven Tyler at Elton John’s Oscar party? Her name is Aimee Preston and the word is she’s the 67-year-old rock star’s new girlfriend. Or not so new. Preston, who’s 28, was Tyler’s personal assistant before she was his girlfriend. The pair have been photographed together in the past, but they looked very much like a couple (at right) at Sir Elton’s Oscar bash. Tyler has been married twice and has four children, ranging in age from 38 to 27.