Hugh Hefner’s new girlfriends, 22-year-old Crystal Harris (ultra sexy photos below) and 19-year-old twins, Karissa Shannon and Kristina Shannon (details and photos), star in the brand new sixth season of “Girls Next Door”, which premiered on Sunday (October 11).

Playboy Twins Kristina & Karissa Shannon ‘Girls Next Door’ (PHOTOS, VIDEO)

Here are some interesting  facts about new Girl Next Door Crystal Harris:

Hails From: Lake Havasu, Ariz., home of the London Bridge. Hef’s “No. 1″ girlfriend was born an American citizen to British parents, but the family (Crystal has two older sisters) moved back to England shortly after her birth. They returned to America to live in San Diego when Crystal was 7 years old. While there, she attended La Hoya High School and majored in psychology at San Diego State University. She is also a licensed real-estate agent.

How She Met Hef: The gorgeous 23-year-old first met Hef at his famous Halloween party in 2008, and they quickly began spending more time together. After a few months of getting to know each other, Crystal started dating Hef and moved into the Mansion.

What She’s Into: An advocate for animal rights, she loves spending time with her dog Charlie, a Cavalier King Charles. She enjoys traveling, good food, comedy shows and listening to all genres of music. Crystal has even started taking singing lessons, inspired by her father who sang professionally. She would love to one day produce and possibly even record some of his unpublished music.

Stuff You Should Know: Crystal stays in shape by working out five days a week and loves to hike and rollerblade; She is featured in the latest commercials for the Guitar Hero; She was on her high school basketball team; She’s an amateur ichthyologist, with two freshwater fish tanks in her bedroom; Her first car was a 2002 Mustang convertible. Vroom, vroom!

Girls Next Door Sneak Peek Video

Playboy Crystal Harris Pictures