The couple visited the sea otters, elephants and other animals for a few hours, reported People magazine.
"They were super cute together," an onlooker said.
On Friday, the duo had a romantic meal at Mastro's and afterwards caught a showing of 'Think Like a Man Too'.
The on again off again couple first split in November 2012. Since then, Gomez, 21, and Bieber, 20, have come together a few times only to split again.
"Justin's extremely doting on her, and there hasn't been one second where he hasn't been touchy-feely and sweet with her. They're pretty inseparable and very affectionate," a source said.
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