The 24-year-old singer was seen enjoying and taking selfies with the people, reported E! Online.
"She enjoyed herself and was there for a late lunch. She couldn't have been more gracious to everyone and to the fans and was more than happy to take pictures with whoever," a source said.
Gomez's fans also took to Twitter and posted sweet messages for the singer along with her pictures with them.
In August, Gomez said she is taking a break due to complications of her autoimmune disease, Lupus. She also cited "anxiety, panic attacks and depression" as side effects.
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