"They sat across from each other and listened to a jazz singer," the source said.

It looks like Bieber and Gomez enjoyed a good conversation and a little PDA, too.
"It seemed like a serious conversation, but Selena broke into a smile a few times," the source said. "At the end of their conversation, Justin came over and put his hand on Selena's shoulder and gave her a little massage. She gave him a long, very tight hug. She seemed so happy and comfortable with him. She didn't want to let him go and then they kissed quickly and said goodbye. Selena was smiling and very happy with what Justin had said."
The off-and-on couple recently reignited their romance following Gomez’s split from The Weeknd, her boyfriend of nearly a year, and have been seemingly inseparable since. In addition to multiple outings at church and  restaurants, as well as spending time at each other’s houses, the duo, who last split in 2014, were spotted kissing at Bieber’s hockey game in Los Angeles on November 15. 
 
“Selena and Justin are back together,” a source told Us Weekly earlier this month. “Selena and The Weeknd just fizzled and ended amicably — it wasn’t dramatic and it wasn’t about Justin. But Selena always had feelings for Justin.”

The time feels right for the couple, who sources tell Us began talking again following Gomez’s kidney transplant in May. A second source noted: “They have both grown up tremendously and think that this is their time to get back to where they were before, but more in love than ever.”