Pictures of Celebrities at Mardi Gras and Carnival

It's Fat Tuesday, and that means the Mardi Gras party is under way! With all the Carnival celebrations around the world, there are plenty of opportunities for stars to get wild. Gisele Bundchen got in on the action in Rio last year while Matthew McConaughey, Britney Spears, Kate Hudson, and others have participated in the festival fun from Brazil to New Orleans in the past as well. Click through to get the party started!