A woman claiming to have had a 31-month affair with Tiger Woods has come forward to Us Weekly Magazine, reports TMZ. Armed with voicemails and text messages from the superstar golfer, Jamiee Grubbs, tells Us Weekly she met Woods in Las Vegas two years ago. TMZ reports Grubbs says she had 20 sexual encounters with Woods. She also has a voicemail from as late as two weeks ago where Tiger "suggests" his wife might be aware of their fling. The Us Weekly issue comes out tomorrow.