Finding summer love is tough -- and it's even tougher in Hollywood! Hmm, that must be the reason why Lauren Conrad loves to recycle her men: rumor is she's been hooking up off-camera with her ex, Stephen Colletti. (They even had a cute movie date and saw Iron Man together!). We're not sure how serious these two are, but we've got the scoop on other celeb duos that are definitely on. So who's head over heels in love, who's on the rocks, and who's just getting their romance started? Get the scoop on summer's star couples now!

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