On this season of The Girls Next Door, it's out with the old, in with the new. Watch to see how Hef's new lady friends—Crystal and twins Karissa and Kristina—settle into life in the Playboy Mansion!

The new season follows Hef and his new girlfriends as they embark on fresh adventures, hilarious antics and all new craziness, from celebrity-filled parties to travels around the globe to romantic movie nights at home.

An all-new season of The Girls Next Door premieres at a special time: Sunday at 10:30/9:30c, only on E!