Credit: Mark Dadswell/Getty Images

What would Jaimee Grubbs think?

TMZ has published two grainy photographs of Tiger Woods chilling at Las Vegas club Tao -- with a companion. (See the photos here.) Taken on Oct. 4 around 1:30 in the morning, the photos show the golfer, 33, chatting closely with a smiling brunette.

Holding a cocktail, the mystery woman wears a short black dress.

The golfer's female friend in the shots doesn't appear to be Jaimee Grubbs, Rachel Uchitel ...and certainly not his blond wife Elin Nordegren.

Stars caught cheating: see the photos here

Grubbs, a 24 year-old cocktail waitress, speaks in the new Us Weekly about her 31-month affair with the golfer.

"I loved how we got along," Grubbs tells Us Weekly in its new issue. "But I knew, in the back of my mind, there could never be just us. There would always be the wife, or somebody else."

For more on Tiger Woods' secret double life -- including neighborhood talk about how Elin "beat his ass" over his infidelities; how Rachel Uchitel bragged doing "nasty sex stuff" with Woods and whether his $1 billion estate is at stake -- pick up the new Us Weekly today!