Chris Brown and Karrueche Tran
National Photo Group
06/01/2012 AT 06:00 AM EDT
seemed to be having quite a time with girlfriend Karrueche Tran.
The couple kicked off their adventure at day club XIV Summer Sessions in Hollywood, where Brown "sprayed bottle after bottle of Ace of Spades champagne," an onlooker says, adding that Stacy Keibler sat tables away with girlfriends trying to stay dry.
Following their daytime fun, Brown and his lady love made their way to Greystone Manor in West Hollywood, where he continued spraying partygoers with "thousands of dollars of rosé champagne," the source says.
Joined by two security guards carrying umbrellas to protect them from the hailing champagne and confetti, the couple hung out with a small entourage and danced to house music. – Jennifer Garcia