Shannon Twins Go Bottoms Up In Cancun

Making a brief trip south of the border, Karissa and Kristina Shannon headed to Cancun, Mexico for the Spring Break 2011 festivities.

The Playboy beauties ventured to the popular locale on Thursday (March 10), with Karissa tweeting, "Taking off to Cancun!!!! I'm so ready to party this party tonight is going to be one memorable party no matter how drunk you are!!!!"

Once arrived, the ladies - who were joined by Kristina's beau Sam Jones III - proudly showed off their backsides in the crystal clear waters while also spearheading a raucous party at Daddy O.

Having since made their way back to California, it certainly sounds as if Karissa and Kristina didn't hold back on their celebratory efforts. Kristina tweeted on Saturday morning (March 12), "Just got back frm Cancun!! OMG We are so HUNGOVER!