08/01/2012 at 06:00 AM EDT
Talk about a special guest!
schmoozed with her boyfriend
Taylor Kinney's family over the weekend, when she joined him at L.A.'s Westlake Village Inn for his brother's wedding.
Spotted by a onlooker at Bogies, the hotel's on-property lakeside bar and lounge, Gaga sipped on pineapple, orange juice and vodka.
Adds the insider to PEOPLE, "She was relaxing in a cabana with the wedding party." – Jennifer Garcia