Leonardo DiCaprio & Bar Rafaeli: Its Back On!

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Leonardo DiCaprio and ex-girlfriend Bar Rafaeli looked to be very much back together as they shared a "long passionate kiss" at a Las Vegas New Year's Eve party.

The pair – who reportedly split in October - saw in 2008 at new nightclub The Bank in the Bellagio Hotel, along with 15 friends including actor Lukas Haas.

A fellow partygoer told Us Weekly magazine: "They all spent the night taking loads of pictures of each other. Leo even stuck out his arm to take a picture of himself and Bar cuddled up together.

"At midnight they shared a long, passionate kiss. It was a real make-out session."

The Departed star and the Israeli supermodel helped down $30,000 bottles of three-litre Moet White Gold champagne and vintage Dom Pérignon champagne at their VIP table.

The source added: "When the DJ played Kelly Clarkson's Since U Been Gone Leo started jumping up and down."

We guess that would be most people's reaction to hooking up with Bar.