Just when Tiger Woods thought his week couldn’t get any worse, it has.

Celebrity magazine US Weekly is reporting that Woods conducted a long-term affair with a Los Angeles cocktail waitress, and claims to have the voice mail and text messages to prove it.

According to the magazine’s website, Jaimee Grubbs, 24, says she began having a sexual relationship with Woods in Las Vegas in April 2007 and that it lasted 31 months — suggesting that the alleged relationship ended only recently.

US Weekly posted a voicemail on its website Wednesday morning, which the magazine claims is from a call Woods made to Grubbs on November 24, in which he suggests that his wife, Elin, might suspect he has been having an affair.

"Hey, it's Tiger," the voice on the recording says. "I need you to do me a huge favor. Can you please take your name off your phone? My wife went through my phone and may be calling you. So if you can, please take your name off that. Just have it as a number on the voicemail. You got to do this for me. Huge. Quickly. Bye." (Listen to the voicemail at usmagazine.com.)

The world’s top golfer has been caught in a media storm since an early morning car crash outside his home on November 27. The fallout from that incident has led to all manner of colorful allegations against Woods, with rumor and innuendo far outpacing facts and evidence. One such allegation, published by the National Enquirer, is that Woods had been having an affair with a New York hostess, Rachel Uchitel.

Woods has not addressed any specific accusation but released a statement in which he said rumors circulating about him and his family are false and unfounded. Uchitel has furiously denied the affair and hired an attorney.

In this case, Grubbs claims to have photos and 300 explicit text messages from Woods, who married Elin Nordegren, the mother of his two children, in 2004. Grubbs recently appeared on the VH1 show "Tool Academy."