(NOLA.com) - "The encounter, posted on a video in Twitter by drMediaPro, shows Aguilera hopping on stage and trying to sing with the band at an unidentified bar. The band’s singer looks confused and refuses to pass the microphone, prompting Aguilera to gracefully step off stage. The person who posted the video on Twitter wrote his wife had recorded it in a New Orleans bar Thursday night. The bar was not named."