Happy 21st Birthday, Karissa and Kristina Shannon!

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Playboy model / sex tape star Karissa Shannon celebrated her 21st birthday yesterday with a champagne-soaked party in NYC. The co-guest of honor at the bash?

Twin sister Kristina Shannon, of course!

Karissa looked so delighted when boyfriend Sam Jones III gave a pair of Louboutins which cost $1,495 - he forgot to take the price tag off, what are the odds?

Kristina Shannon and Karissa Shannon Strike a Pose

Karissa Shannon turned 21 last night, as did Kristina Shannon. Sam Jones III? He was just there for the photo ops. [Photos: PacificCoastNewsOnline.com]

With proceeds from the Karissa Shannon sex tape, Sam can afford all sorts of fancy gifts for his girl, who became a D-list name in 2008, thanks to Hugh Hefner.

The twins were two of Hef's three hoes for a bit. Yet despite the "girlfriend" status, Karissa claims the relationship was "more for fun" and the chance to be on TV.

Wow, you mean a couple of 19-year-old twins weren't just itching for the chance to double-team an octogenarian? Shocker. Anyway, happy birthday girls!

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