The Biebster duetted with Smiley Miley on stage at his Madison Square Garden concert in New York earlier this summer.
Now sources say Justin is smitten with the 17-year-old actress/singer - who is a year his senior.
"When Justin and Miley sang Overboard together, he kept reaching out to put his arm around her," an insider revealed to National Enquirer.
"Justin flirted up a storm with Miley and tries some slick moves to draw her closer every chance he got. But Miley never reciprocated. She later told a friend, ‘Justin’s adorable, but he’s too young for me.’"
Rumor has it Bieber is already moving on from his crush on Cyrus, as he is thought to be dating Jasmine Villegas.
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