2. The Playboy beauties show off their assets!
4. Karissa received a pair of $1,495 Christian Louboutin shoes from her boyfriend Sam Jones.
Karissa and Kristina Shannon Turn 21
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 The Shannon Twins celebrated their 21st birthday at Via De Mille for dinner followed by a party at Greenhouse Nightclub. Photo: Pacific Coast News
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Karissa and Kristina Shannon Turn 21
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 The Playboy beauties show off their assets! Photo: Pacific Coast News
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Karissa and Kristina Shannon Turn 21
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 Karissa and Kristina received a pink cake and numerous bottles of champagne. Photo: Pacific Coast News
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Karissa and Kristina Shannon Turn 21
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 Karissa received a pair of $1,495 Christian Louboutin shoes from her boyfriend Sam Jones. Photo: Pacific Coast News
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Karissa and Kristina Shannon Turn 21
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 The birthday girls danced around barefoot and even drank liquor straight out of the bottle! Photo: Getty Images
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