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Today might just be the first day of March for most of us, but it happens to be a very special day for two big pop stars in the big bad world of music.

Who are we talking about? Well, if you’re a Belieber or an Animal, you’d know that it’s Justin Bieber and Ke$ha‘s birthdays!

DETAILS: Ke$ha Is Selling Her Blood!

While Ke$ha is turning 26, and Justin is turning 19, they are still hitting some big milestones in their life, as well as their careers.

From selling out arenas all on their own, to emptying store shelves with their own endorsed products, these two have a lot to celebrate – being two of the most popular sensations on Earth right now!

These two have quite the badass reputation in Hollywood, and they’re both known for having some outrageous moments.

PHOTOS: TAKE IT OFF! Justin Bieber Dares To Go Shirtless In London

It’s time to put these two side by side and determine who wins in the birthday battle between their most outrageous moments.

Take a look at Ke$ha vs. Bieber below and tell us who you think is the most outrageous!

It might be one of the weirdest fetishes we’ve heard of, but what floats Ke$ha’s boat is putting people’s full and fluffy beards in her mouth. She’s done so at tons of parties and events, and it looks like she’s not stopping.

Yeah, so many celebrities have been caught with a blunt here and there at parties. But Justin Bieber has a fan base that ranges between 8-year-olds and 16-years-olds (OK, so there are some unashamed 30-year-old mothers who can’t resist the Biebs either) which has put him in a tough position to be a young role model.

It might just be us, but it seems like Ke$ha has this battle in the bag just for the mere fact that she’s drank her own urine on stage!

Everyone gets a haircut, yes, but Justin is crazy to cut his because he was well aware of the possible backlash he would be getting from his hardcore stanning Beliebers. We’re glad that the Biebs is still alive after cutting off those famous locks.

It seems pretty perfect that Ke$ha would get a tattoo on the inside of her lip that says “Suck It!” We wouldn’t expect anything less.

Justin Bieber got the opportunity of a lifetime to try and bump and grind up on Nicki Minaj, and boy, did he take it without hesitating. Who wouldn’t?

Ke$ha might have earned the “ratchet” label for peeing in public, and sharing a picture of her doing it with the world.

At age 18, it’s OK to act rebellious, but flipping the bird to the paparazzi is a bold move.