Happy Birthday to Ke$ha and Justin Bieber

It's a crazy day in the world of Buzzworthy, as two of our favorite artists, Justin Bieber and Ke$ha, celebrate their birthdays today.

At 16, Justin Bieber is king of the world. He's friends with people like Diddy, Usher and Asher Roth, he makes great, sugar-coated R&B and drives fans into emotional overdrive. With his new release, My World 2.0 on the way, he's sure to have a pretty sweet 16th year.

What can you say about Ke$ha? Well, by snagging a number-one song for "TiK ToK" and a No. 1 album with Animal, she's reclaimed the chart throne for alt-rock queens everywhere. Plus, with her new single, "Blah Blah Blah," catching fire, this trash-pop diva is making sure her 23rd year is off to a great start.

Instead of dishing out birthday presents, we'd pass along these two amazing fan-made videos. Check out adorable 12-year-old Avery singing and dancing to Ke$ha's "Tik Tok" (found via Buzzfeed) and a special Justin Bieber birthday rap, courtesy of two superfans.

Enjoy and happy birthday, Justin and Ke$ha!

Tags Asher Roth, Diddy, justin bieber, Ke$ha, LOL, Usher, video