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. Kim Kardashian and Kanye West are touring Brazil just in time for the festivities, as are couple Megan Fox and Brian Austin Green. Gisele Bundchen got in on the action in Rio in 2011 while Jennifer Lopez, boyfriend Casper Smart 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!

Megan Fox and Brian Austin Green shared a kiss while watching the parades in Brazil on Sunday. The couple are spending time in Rio de Janeiro for Carnival, and have already been busy taking in the festivities. They kicked off their trip with a visit to the Heliopolis Urbanization Project in São Paulo, and Megan later made a solo appearance for Brahma beer. Although Megan and Brian were able to get in some alone time as a couple, it has been a family-filled getaway. Megan and Brian debuted baby Noah Shannon Green while checking out the sights yesterday.

Megan and Brian aren't the only stars participating in the festivities of Carnival — Kim Kardashian and Kanye West linked up with Will Smith to visit tourist attractions around Brazil yesterday.

Mayor of London Boris Johnson pokes his head out between the feather headdresses of Genesis Mas Band members ahead of the Notting Hill Carnival this weekend.

The Genesis Carnival Company, a costume design and performance company, was founded by a cofounder of the Notting Hill Carnival, so its members have been performing in the local festival for 30 years. This year the band's theme is "Myths and Treasure Beneath the Sea," so think mermaids, treasure, coral, and sea horses. See the extravagant dancers in all their sparkly glory as they get ready for the float- and party-filled celebration!

Happy Mardi Gras! Get some beads and commit a sin — but not a relationship sin. Although today is the day of excess and indulgence, the world has been counting down all week with costumes, parties, and parades. From South America to Europe, see the celebrations in pictures.

Mardi Gras, Fat Tuesday, Fastnacht, whatever you call it, the countdown has begun for the great day of sin on March 8. But much celebrating is to be done between now and then. In Germany, these performers prepare for Women's Carnival Day, which kicks off carnival next Thursday. Doing whatever they please, women rule the day and drink late into the night. Men can join, if they settle the checks!

Happy Mardi Gras! Today marks the culmination Carnival, the festive season of masquerades, street parades, and all-out revelry that goes down right before Lent. While you indulge in your guilty pleasures, check out how other people have fun around the world.

While today may be Mardi Gras, carnival has partied its way around the world for the last week. From the rain forests near Rio to the Alps in Germany, see how the world celebrates sin in my slideshow!
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