Huge legal win for Steven Tyler ... the woman suing him for allegedly sexually assaulting her over 50 years ago when she was 16 years old just had her lawsuit against him whittled down significantly. Julia Holcomb is suing the legendary Aerosmith frontman over a years-long relationship back in the day ... she filed her lawsuit in California and included a bunch of claims about sexual encounters in various states ... but now a judge has ruled only one claim from an alleged incident in California