Pop star Britney Spears surprised fans with an appearance at promoter Jeffrey Sanker's White Party, a gay festival in Palm Springs.
E! News said Spears was at the party to support Agnes, who shares the same manager, Larry Rudolph, as Spears. Sources said Spears watched from a $20,000 viewing platform surrounded by security.
KPSP reports Spears "stayed low-key, sipped on cranberry juice and danced along to the music."
At the White Party in Palm Springs," Spears tweeted. "Sooooo fun!!! About to check out Agnes."
Real Housewives of Atlanta star Kim Zolciak, dressed in a black tutu, also performed her single "Tardy for the Party" with co-star Randi Burress.
"I'm so excited to be here. I lost my voice now (after so much rehearsal)," Zolciak told KPSP. The event will be featured on an upcoming episode of Real Housewives.
View a video below of Britney Spears' appearance and Kim Zolciak's performance at the White Party.