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Justin Bieber

Ethan Miller/Getty Images

Attention, cougars! At long last, the day you've been waiting for has arrived: Justin Bieber is officially a man now.

Let the newly appropriate perving commence.

Gallery: Justin & Selena...Aww!

That's right, the pop superstar who launched Bieber fever, spawned thousands of copycat swoopy-haired adolescent boys and wreaked havoc on the hormones of preteen girls everywhere has finally been ushered into adulthood as today marks his milestone 18th birthday.

And obviously, we're not the only ones who have counting down.

"Almost legal," Biebs himself tweeted yesterday.

How will he celebrate? What will teenage hate symbol girlfriend Selena Gomez gift him? Will it be better than the gift from his manager? Time will tell. Until then, we're celebrating Bieber's milestone birthday with a look back at the enduring appeal of the Biebs. So, happy birthday, Justin!

And ladies? You're welcome.