While Rachel Uchitel is vehemently denying reports of an affair with Tiger Woods, another alleged mistress is stepping forward to proudly “reveal” her steamy 31-month fling with the top athlete.

24-year-old Jaimee Grubbs claims to Us magazine that she began an affair with the 33-year-old family man in April 2007, boasting they went on to have 20 sexual encounters with Woods, who allegedly sent her more than 300 racy text messages.

Grubbs recently appeared on VH1’s “Tool Academy.”

Meanwhile, Unchitel, the rumored mistress of the golfer, told the New York Post that she offered to take a lie-detector test to the Enquirer to disprove the story.