The cover-up didn't cover much as it fell down Brittny's backside while she swayed her hips to the music, almost completely revealing her bare bum.
During her solo dance party, the now-blond kept fiddling with her thong—either picking a wedgie or creating an even bigger one, we couldn't tell.
Our photog spotted the pair together at the Grove in Los Angeles ...
and as soon as our camera started up, they split in opposite directions.
Her BFF’s writing a love song with her own singing superstar!
Radar has learned exclusively that Brittny Gastineau is giving her off-on romance with former flame Luis Miguel another try.
While at the Spice Market, she said about her dear friend Kim Kardashian's engagement: "I can't believe that the time has come," she said.