Lady Antebellum helped Oreo celebrate its 100th birthday with an impromptu acoustic concert at The Grove in Los Angeles. They also sang “Happy Birthday” to one of the nation’s favorite cookies, as well. It was followed by a small flash mob doing a dance for Oreo. 

The free show was one of seven parties staged in various cities including Pittsburgh and Washington, D.C. Lady A are also participating in Oreo’s Facebook promotion ” Join The Movement,” which encourages FB followers to share their favorite Oreo moment.