We've got love on the brain — particularly small screen love.So many couples have fallen in love on set (just check out all the actors who found love on movie sets), and the same is true for TV stars.

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Their Mad Men love story isn't so romantic — Pete and Beth both cheat on their spouses — but in real life, Vincent Kartheiser and Alexis Bledel's situation lacks the scandalous aspect, and they got engaged earlier this year.

On Gossip Girl, Carter Baizen romances both Blair and Serena, but he has more of a legitimate relationship with Serena.

However, the real-life legitimate relationship was between Leighton Meester and Sebastian Stan, who dated for a couple of years while the show was still on.

How sweet is this: not only do Ginnifer Goodwin and Josh Dallas play a romantic-sounding couple on TV (Snow White and Prince Charming), but they're in love in real life, too — and they just got engaged! We still think of Seth and Summer as one of our favourite TV couples, and it was even sweeter when Adam Brody and Rachel Bilson dated in real life.

But now Seth is dating Blair, and my brain is exploding.

They were passionate high school couple Lucas and Brooke on One Tree Hill, and that passion carried over into a romance and eventual marriage for actors Chad Michael Murray and Sophia Bush.

But unfortunately, much like their characters on the show, it wasn't meant to be, and they split up.

— Additional reporting by Laura Meyers Related stories: Gossip Girl's other golden couple, Serena and Dan, have several breakups and makeups over the series' run, but they ultimately end up together.

While Blake Lively and Penn Badgley also fell in love in real life a few years ago, their romantic destiny never led them back together.