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Not Dating Comedian Jeff Dye

Kristin Cavallari's still very single ... despite that recent video of her getting flirty and kissing a comedian.

Sources close to the situation tell TMZ ... there's nothing serious going on between Kristin and Jeff Dye, and in fact -- we're told they've only hung out that one time they were seen in Chicago looking like a new couple.

Our sources say Kristin's just having fun right now and doesn't have -- nor is she looking for -- a boyfriend.

As for how Kristin and Jeff connected .