Getty Images file photoThe former “Green Lantern” co-stars make an absolutely adorable All-American couple.

Which celeb couples will last in 2012?

These brightly burning star pairs are pretty hot and heavy right now, but will their well-documented  love lives continue to sizzle next year — or  just suddenly fizzle?

Blake Lively & Ryan Reynolds

The former “Green Lantern” co-stars make an absolutely adorable All-American couple. But we can’t help but worry about the fact that they fast-forwarded into nesting mode immediately — the “Gossip Girl” star is even checking out apartments with her man, after just a few months! Plus, remember what happened the last time Ryan fell for a younger blonde actress? Prognosis: Cautiously optimistic.

Eva Mendes & Ryan Gosling

They both have burning-hot sex appeal, but their dynamic doesn’t seem combustible in the negative sense. They’ve managed to keep this budding relationship relatively under the radar in terms of paparazzi — their major PDA photo opportunity thus far was cuddling at the Eiffel Tower, him holding a single red rose for her. Hearts everywhere subsequently melted. Prognosis: Hot!

Kourtney Kardashian & Scott Disick

With most couples, news they’re expecting a second child would be a crystal-clear sign the relationship was strong. But the bickering reality stars weren’t even together when Kourtney found out she was expecting firstborn son Mason — and if the latest season of “Kourtney & Kim Take New York” is any indication, parenthood hasn’t slowed down the constant stream of drama one bit. Prognosis: Mixed signals.

Justin Bieber & Selena Gomez

The toothsome teen twosome might just have a more solid, mature connection than many Hollywood stars twice their age. Already they’ve weathered a groupie’s paternity suit and death threats against Selena from a Twitter mob of jealous Beliebers. But will all this female attention serve as a reminder of how desirable her guy is … or a cue to bail? Prognosis: Who can tell with these kids today?

Jessica Biel & Justin Timberlake

Will the second time be the charm for this on-again couple? They had a four-year relationship before calling it quits … then got back together right away. But we can’t help but wonder whether this means a return to the status quo, or that they’re ready to take the relationship to the next level. And if Justin thinks it’s the former, will Jessica be OK with that? Prognosis: All in or all out.

Katy Perry & Russell Brand

Rumors that their two-year marriage is already over have dogged the pop star and her British husband, but they’re staunchly insisting it’s only just begun. Given Katy’s religious upbringing and Russell’s recent avowal that his vows were definitely till death do us part, we’re guessing these two will make every effort to smooth over any bumps in newlywed life. Prognosis: Still in it to win it.

George Clooney & Stacy Keibler

George gave her dancing skills props back when she was on “DWTS,” and now the former wrestler is the current girlfriend of the “Descendants” star. But will Stacy be the one to make the notorious bachelor finally settle down? Don’t hold your breath. We have a suspicion that her gushing about him via Twitter and to the press might get on George’s nerves after a while. Or the cause of their eventual breakup might just be that, hello, it’s George Clooney! Prognosis: Hello, it’s George Clooney!

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