Stephen Colletti

Sources tell us Kristin was smooching comedian Jeff Dye in this video we obtained. Unclear for now if it was a one-off, or if they've been a thing for a minute now -- but either way ... she's in for some laughs if this is, in fact, her new boo thang. Dude's pretty funny. He's been around in the…

Kristin Cavallari's reunited with Stephen Colletti, her ex-boyfriend from their "Laguna Beach" days, but frenzied fans hoping they're getting back together should know ... there's nothing romantic going on. Kristin immediately sparked the rumor Tuesday when she shared a photo hugging on Stephen…