Zac Efron was treated to a $100,000 bottle of champagne on a night out in Chicago.

The 'Charlie St. Cloud' star was presented with a Nebuchandnezzar - a 15 litre bottle - of Armand de Brignac Champagne, also known as the 'Ace of Spades', from the son of a Russian billionaire while at the Board Room nightclub on Tuesday (04.10.11), according to

Zac was there with actress Heather Graham, as the pair are currently in the city shooting a new drama movie directed by Ramin Bahrani.

However, the rich Russian did not stop at purchasing alcohol for the stars - he also bought numerous bottles for his own table, including two magnums of Dom Perignon champagne, two magnums of Grey Goose vodka, three magnums of Laurent-Perrier Brut Rose and four bottles of Cristal, with the total price coming to $112,550, plus a $22,510 tip for the waitress, named Jasmine.

Zac broke up with 'High School Musical' co-star Vanessa Hudgens in December, and has been ploughing on with work since - although he is said to still not be over her, and was struggling to see her with rumoured new boyfriend Austin Butler.

A friend of Zac's said during the summer: "Zac is still not over Vanessa. His heart is broken and he can't get over her. He may seem happy on the outside, but inside he is hurting.

"He regrets ever ending his relationship with Vanessa."