Shannon Twins' Birthday Celebration At Vanity

Karissa and Kristina Shannon's 21st Birthday Tour hit Vegas and the Worlds Most Famous Playmate Twins made history in Vanity partying like it was greatest day of their lives to the sounds of Eric D Lux.

Credit: Spy On Vegas

The Shannon Twins Celebrate At Sugar Factory

Kristina and Karissa Shannon celebrated their 21st birthday's at Sugar Factory on October 2, 2010 in Las Vegas, Nevada.

Credit: Film Magic

Karissa & Kristina Shannon's 21st Birthday Bash

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.

Definitely not a PG affair, Kristina was going wild as she danced around barefoot while drinking straight from the bottle alongside her sis.

Meanwhile, Karissa looked delighted as she unwrapped a gift from her boyfriend Sam Jones III - as her man doted her with a pair of Christian Louboutins which cost a cool $1495.

Credit: Celebrity Gossip

Heidi Montag To Recruit The Shannon Twins

Heidi Montag has left the Malibu beach house where she had been hiding and is now hanging with Hugh Hefner's twin ex-girlfriends. Why? She wants the Shannon girls to join The Heidi Show!

A source close to Heidi tells X17online exclusively that Heidi spent Tuesday afternoon with 20-year-old twins Kristina and Karissa Shannon, adding:

"Heidi knows that if she's going to be doing a show about her wild and crazy summer life, she has to get moving on it. Now that the twins are single, Heidi wants them to be a part of her show."

As for Spencer, "He's totally pissed that Heidi spent time with the Shannon twins. They are the last people that Spencer wants having an influence on her," says our source.

Heidi has also been spending time Jennifer Bunney (the dumb skank Heidi convinced to sleep with her best friends ex, Brody). However our source tells X17online, "Jen obviously wants to be famous. She has gone out of her way to let everyone know that she is going to be part of Heidi's show. Seems a bit desperate, don't you think? With the Shannon twins there, no one is going to care about Jen."

Credit: X17 Online