Justin Bieber and Selena Gomez were both in Oslo, Norway this weekend, working on Act 3, Scene 4 of their relationship. I doubted these two as a couple for so long—they're so busy, how do they see each other, they're just babies!—but now it seems legit. They are obsessed with each other.

Watch: See How to Create Selena Gomez's Braid!

There are just certain couples who cannot stay away, no matter how problematic their relationship may be. You gotta admire chemistry like that! Check out the following…

Megan Fox and Brian Austin Green

These two met when Megan was only 18 years old, and got engaged when she was 20. They broke off the engagement, got back together, and finally got married after six years together. She's even been a major force in the life of his son from a previous relationship, Cassius.

Sammi "Sweetheart" Giancola and Ronnie Ortiz-Magro

Anyone who has seen a single episode of Jersey Shore knows that Sam and Ronnie put the "again?!" in on-again, off-again relationships. They would fight, split, scream, kiss and make up, and split again at least once per hour-long episode. But they're currently very on and even considering marriage.

Kourtney Kardashian and Scott Disick

This couple has been smushed together through most of their 20s, through cheating suspicion, drinking problems, surprise pregnancies, and plenty of making and breaking up. Even in old episodes of Keeping Up with the Kardashians, you can see them making out in the background of scenes! They're for life, even if they won't get married.

Pink and Carey Hart

Believe or not, this duo has been together on and off for twelve years! They got married in 2006, split in 2008, started dating again in 2009, and had a beautiful baby together in 2011. They're so rough and tumble (and hot), how could they be with anyone else??

Rihanna and Chris Brown

Well…sigh… you all know how this story goes! It might make the rest of us gnash our teeth together, but they clearly love each other.

Why do these couples work so well? Which one is your favorite? Do you think Selena and Justin are going to last? Tell us in the comments below or tweet us at @OKMagazine.

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