According to Us Weekly, Lopez and Smart were spotted hanging out in a BMW looking as though they were having a pretty good time together.
"Casper was driving and J.Lo was in the passenger seat. They had the music on loud and were both grooving to the music and laughing together," an onlooker told Us Weekly.
Once they noticed photographers were present, the 45-year-old singer began "sliding down as low as she could in her seat so she wouldn't be seen. Casper put the top up and then they went back to her house."
The question on everyone's mind now is: Are Jennifer and Casper back on? "They are still friends," a source told E! News. "They are not back together."