Jon Gosselin left his brood of eight at home with Kate to host a pool party at MGM Grand's Wet Republic in Las Vegas on Saturday.
The reality dad, who arrived to the bash with his mother and four pals, told reporters, "It looks like we'll have a good time," before making a splash at the party.
Gosselin hung out in his VIP cabana for two hours, noshing on trays of food and sipping Vueve Clicquot champagne. According to People magazine, Jon even found the time to chat up a few ladies and get their phone numbers.
While Jon partied at the pool, Kate invited bodyguard Steve Nield and his family to the estranged couple's home in Reading, Pennsylvania -- contradicting reports that she's romantically involved with Nield.