Kourtney Kardashian is 34 today! I know that Kim gets all the attention and Khloe gets all the laughs, but I'm here to argue that Kourtney is actually the heart of the show and the best one to watch. Check it out!

Photos: See the sweetest moments of Kourtney and other celeb moms with their kids!

She brings the real drama to Keeping Up with the Kardashians. Over the years, she's dealt with a potentially cheating and alcohol-abusing boyfriend (that would be Scott Disick), a swinging single life, a surprise pregnancy, and new motherhood. She's totally grown up before our eyes!

She has cultivated a unique street style all her own: sort of a chic '70s bohemian look.

She takes major fashion and beauty risks on the red carpet. The girl is certainly never boring!

She's part of a power couple. I really can't picture these two with anyone else—they fit so well together (even if they won't get married).

Watch: See where Kourtney and Scott went on vacation this winter!

She's turned out to be a wonderful mother! She is so playful with her kiddies, and is fiercely dedicated to giving them healthy food and the right kind of toys.

Her son Mason Disick is the best addition to the cast since her father, Scott. He has some great one-liners, like this one:

Photos: See adorable pics of Mason playing on the beach with his parents!

We haven't seen much of her baby Penelope yet, but what we have seen is appealingly chubby! Great headwear, girl.

Photos: See what it's like to grow up as Kourtney and Scott's kid!

Kourtney herself was a cute little kid.

She has an awesome Instagram account. Look at this cute pic with Scott! Follow her at @kourtneykardash.

She's the kind of gal you call in the middle of the night with an emergency, and she comes to pick you up immediately. Don't she and Kim look amazing sans makeup?!

Is Kourtney your favorite sister? Would you like to make the argument for another one? Tell us in the comments below or tweet us at @OKMagazine.

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