Making for quite the reason to celebrate, twin sisters Karissa and Kristina Shannon rang in their shared 21st birthday with a booze-fueled party in New York City on Friday night (October 1). The Playboy beauties – who turned 21 at midnight – first went to dinner at Via De Mille restaurant in SoHo before heading to their very own party at Greenhouse nightclub.

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Karissa and Kristina Shannon’s 21st Birthday Bash