Tiger's Poker Night presented by the World Poker Tour in Las Vegas on Friday, May 17. Credit: Joe Giron for World Poker Tour

Tiger Woods is doing good -- and evidently having a very, very good time doing it! With girlfriend Lindsey Vonn at his side, the golfer, 37, hosted his annual Tiger's Poker Night at Moorea Beach Club Beachside Casino at Mandalay Bay in Las Vegas on Friday, May 17. Presented by the World Poker Tour, the $10,000 buy-in poker tournament benefits Woods' titular foundation.

Before the bash began, a hotel employee spotted Woods entering the casino with a coterie of women, including Vonn, 28 -- and already appeared to be enjoying himself. "He looked like a hot mess!" the employee cracks. "His hair was all messed up."

Once inside the casino, Woods quickly lost to an amateur player, but happily stayed throughout the tournament to hob-nob with other other celeb guests -- including Mark Cuban, Kid Rock, Mehki Phifer, L.A. Clippers player Chris Paul and many poker pros, with the band Lifehouse performing towards the end of the evening.

The evening was part of the weekend-long Tiger Jam in Vegas, benefiting the Tiger Woods Foundation. Wearing a sexy blue dress during the poker tournament, Vonn was thrilled to be part of the weekend, and took along her sister, Karin Kildow for the festivities. "The girls at Tiger Jam!" she tweeted.

It's been an eventful May for the couple -- who made a splash at the Met Gala  two weeks ago, and showed off their beach bods hanging out on Woods' yacht in Florida earlier this week.

To donate to the Tiger Woods Foundation -- which provides scholarships and other educational opportunities for underserved youth -- click here.