If you have $10,000 and no soul, I've got the perfect Christmas gift for you: The engagement ring that Roman Polanski bought for Sharon Tate in 1967 -- the one she was wearing when the Manson family murdered her and her unborn child -- can be yours! The website GottaHaveRockandRoll.com is graciously putting the Valley of the Dolls star's jewelry up for auction, and if you wanna go a little helter-skelter this holiday season, I suggest you snatch up the pricey trinket without looking back. Fancy and fun! Coming up next on GottaHaveRockandRoll.com: Some plane debris with Jim Croce's entrails on it. [TMZ]