The "First Love" singer brought her mother and 6-year-old twins along for the concert series, spending two nights at the Fontainebleau Miami Beach.
"Max and Emme enjoyed the pool and had a great time," a source tells PEOPLE about Lopez's kids. "Jennifer had sushi from Blade and loved it. Her mom enjoyed her show and danced to all of her music."
The newly single Lopez, 44, didn't show any signs of reigniting her love life, instead focusing on her family and staying away from the club scene. She split from choreographer Casper Smart in early June after dating for two and a half years. Despite the breakup, Lopez has been living it up promoting her latest album, A.K.A. (which debuted at number six on the Billboard charts and number one in the hip hop and R&B category), performances everywhere from Brazil to New York.
"Jennifer was in a great mood and acted extremely nice and pleasant to media and fans," the source says of her time in Miami.
Reporting by LINDA MARX