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    Justin Bieber sings ‘One Less Lonely Girl’ to 9-year-old girl (VIDEO)

    Juan Naharro Gimenez/WireImage

    Just when you thought Justin Bieber couldn't get any cuter . . .

    Though he normally sings to teenagers (and almost-teenagers) during his concerts, Bieber brought a lucky 9-year-old onstage in London this weekend.

    At a secret concert held Saturday -- the day after he took Wembley Arena by storm (and hung out with Kelly Clarkson backstage) -- the Canadian pop star brought a fan named Leah onstage so he could serenade her with his hit track "One Less Lonely Girl."

    Leah had reportedly spent 24 hours waiting to see her idol -- and it was her birthday! Though Bieber gave her a a personal serenade and a dozen roses for her trouble, Leah also had a gift ready for him. Even at age 9, she made sure he knew of her affection.

    "Did you give me your phone number?" Bieber asked with a grin, reading the message she wrote on a blue gift box.

    The "Boyfriend" singer tweeted Leah's video (presumably filmed by a relative) soon after the show, along with the message: "from 80,000 in Wembley to a club gig the next day...this is why we do it. for the fans. LOVE YOU."

    A day later, Leah was still over the moon.

    "Still can't believe that Justin tweeted my video from the secret show ahhhhhh," she tweeted.

    The secret gig was reportedly part of a TV special Bieber is filming.

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