London, Apr 2 : Troubled singer-songwriter Amy Winehouse has proved that she is never too shy to celebrate, as she gave everybody free drinks at the Hard Rock Cafe in Las Vegas after hearing that her outfit would go on display at Hyde Park.

Winehouse was eating with pals when bosses at the venue revealed that the dress she wore for Nelson Mandela's 90th birthday concert at Hyde Park would go on display.

The `Back to Black' hitmaker immediately declared that she was buying all 140 diners a shot of tequila.

"Amy whispered to one of the waitresses and soon the bar was covered in shot glasses. She invited everyone to help themselves," the Sun quoted a source as saying.

Winehouse stayed up late at the bar with pals. (ANI)