Happy 18th Birthday, Justin Bieber!

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NEW YORK (CBS NEWS) - Justin Bieber will turn 18 on Thursday, and the birthday celebrations are already rolling out for the Canadian star.

In honor of Bieber’s March 1 birthday, fans will try to break a Guinness World Record for “Most Social Media Messages Within 24 Hours.” His fans — called “Beliebers” — are being asked by AgencyNet to visit HappyBirthdayJustinBieber.com on Thursday to receive a specific message to post on social media sites in hopes of reaching 209,772 — the number needed to break the existing record.

Bieber is currently dating Grand Prairie native Selena Gomez, who will turn 20 this summer.

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