Oprah Winfrey -- Tacos and Tequila

12/18/2010 10:30 AM PST BY TMZ STAFF
Oprah Winfrey sure knows how to party.

TMZ has obtained pics from the "taco party" Oprah attended at her pal Megan Castran's place in Australia last weekend -- and our sources say O showed up to the shindig armed with two expensive bottles of Partida tequila.

We're told O threw back ONE whole shot of tequila during the party -- and chowed down on tacos, guacamole and that wacky cake (pictured above) that features Oprah mounting a kangaroo.