Bar Refaeli and Leonardo DiCaprio had a hot-and-heavy make-out session at the new Las Vegas Club on New Year’s Eve so guess they are back together again!

(( Leonardo DiCaprio isn’t shy about letting people know he is back on with ex Bar Refaeli: They had a hot-and-heavy make-out session at new Las Vegas club, The Bank in the Bellagio Hotel, on New Year’s Eve.

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DiCaprio and Refaeli arrived around 11:10 with actor Lukas Haas and 15 other pals. The group sat at a VIP table (stocked with $30,000 bottles of three liter Moet White Gold champagne!), overlooking the dance floor. Throughout the night, says an on-looker, the crew took countless pictures on their personal cameras. (At one point, DiCaprio even extended his arm and took a shot of him and Refaeli.)

At the strike of midnight, the pair “shared a long, passionate kiss,” the eye witness tells Usmagazine.com. They then downed Dom Pérignon champagne.

Kissing wasn’t their only activity — they danced a lot too.