The following evening...
Gaga hit Lavo's two-year anniversary celebration with dinner at Tao. She sent a bottle of champagne over to Tao Group partner Noah Tepperberg for his birthday. (P.S.: Tepperberg toasted his big day in NYC earlier in the week at Avenue with Chace Crawford, LeBron James and Maxwell.)
Also in Vegas, Jenny McCarthy hosted the 4th Annual Midsummer Night's Dream: A Masquerade Lingerie Bacchanalia at Palms Pool & Bungalows. Check out her outfit here! Kevin Dillon was there to celebrate his birthday. He was presented with an honorary Playboy Club key.
Who knew Jamie Foxx was such an avid pingpong player? But there he was, grabbing his personal set of paddles out of his car before playing the game for two hours at new pingpong club Spin Hollywood. Across town, on the same night, Jon Hamm popped into Bardot to catch the band The Like.
All the way in the Bahamas at Aura Nightclub at Atlantis, Paradise Island, Lenny Kravitz hung with a group of friends in the VIP area on Friday as Ray J performed a few songs and hit the dance floor with some friends.
—Additional reporting by Whitney English
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For more Sin City sightings, check out our Party Pics: Vegas photo gallery.