The 19-year-old athlete, who won her fourth gold medal at the Olympics in the gymnastics floor final, shared pictures of herself with the "Neighbors" star on Twitter in which Efron is seen kissing her.
"He kissed me on the cheek just letting you all know @ZacEfron.
"Proof: had to do a retake because I thought we were taking a picture then he kissed me instead," Biles wrote.
She then posted a photo and wrote, "Just call me Mrs Efron already @ZacEfron.
Alongside another picture with the gymnasts, the actor tweeted, "My Olympic dream came true #Rio2016 #FinalFive.
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