Obama is at Revel Resorts with daughters Sasha and Malia where Beyonce is performing Saturday night. The girls were singing along to "Love on Top."
The crowd cheered loudly as Obama made her way to her seat in a shiny green dress. Some took photos while others screamed her name. One fan yelled, "This is history!"
Beyonce entered the stage wearing a glimmering silver outfit and hot pink shoes that matched her nails.
The singer's Atlantic City concerts are the first since giving birth in January to daughter Blue Ivy. She performed Friday night in Revel's Ovation Hall and has shows on Sunday and Monday.Copyright 2012 The Associated Press. All Rights Reserved.