Justin Timberlake bought drinks for an entire Las Vegas nightclub.

The generous star made an unscheduled appearance at Palazzo's Lavo nightspot on Tuesday (September 1, 2009), and treated partygoers to a free shot of his tequila, called 901.

He told guests: "This is a very special evening. Me and my buddy started a home grown tequila down in Mexico and I wanted to make sure you guys got a taste, so I bought everyone in the bar a shot."

Justin, girlfriend Jessica Biel and fellow revelers then cheered and raised their glasses, prompting Justin to say: "We should all believe in something and I believe it's time for another shot of tequila."

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The strong alcoholic beverage is named after the area code of Memphis, where Justin was born.

DJ Samantha Ronson provided the music for the evening, with Justin taking it upon himself to get the crowd dancing. After beatboxing along to the tunes, Justin grabbed the microphone and bellowed: "What's up, Las Vegas?"

The 28-year-old star is doing everything he can to promote the tequila. He has posted a video on the drink's website asking people to send in their "biggest and coolest idea" to market it, with the winner collecting $25,000 and a trip to Las Vegas.

Justin says: "You will also get the title Executive Vice President of Big Ideas for 901, which sounds super fancy... That's because it is."