The pair made out at Las Vegas' LAX club on Sunday, Dec. 30, the night after flirting and kissing at Central in LA.
Conrad (wearing a strapless, knee-length silver dress with an oversized bow on the front) arrived at LAX with Hills co-stars Audrina Patridge and Lauren "Lo" Bosworth.
Thirty minutes later, Colletti – Conrad's ex from their days on Laguna Beach – showed up and immediately joined her table.
The duo were inseparable for the rest of the night, touching each other and whispering. At one point, Conrad positioned herself between Colletti's legs and they kissed.
Colletti kept his eye on Conrad when she took pictures with fans or celebrities – especially when she was being photographed with Dave Navarro.
(Click here to see where The Hills girls celebrated New Year's.)
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It has been confirmed that Season 5 of "The Hills" will be Lauren Conrad's last season. Thoughts?
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