Selena Gomez zoo parents West Hiollywood

Selena Gomez got into some monkey business this weekend!

The "Love You Like A Love Song" singer had a family-friendly Saturday, hanging out at the L.A. Zoo with her mom and stepdad, Mandy and Brian Teefey.

The trio checked out tons of exhibits, and Selena -- dressed in a gray striped sweater, burnout tee, gray leggings and motorcycle boots -- was enthusiastically pointing at a few amazing animals.

But her favorite? Clearly the monkeys. Halfway through the outing, Selena strapped a purple monkey doll to her neck -- and kept it there!

Who said stars couldn't be silly?