Britknee is a character in the SML series. She was originally called Crystal in The Koopalings! She is known to be a hooker. She's also a valley girl.
She is a woman with black hair, red lips, red bra, a blue skirt and red nail polish. She first appears in The Koopalings where she was featured in a commercial for a sexual service and hang up on Junior when he reveals he's 7 years old. She also appeared in Black Yoshi's Blank Check!, she is shown to be a gold digger/prostitute as according to Mario, only likes Black Yoshi because of the money he has, She also appeared in the end giggling perversly causing Mario to get arrested by The Brooklyn Guy who mistook this for a form of prostitution. She also appears in The Fishing Trip! as a lifeguard, she sees Junior being attacked by a shark and tries to use a beach ball to save him. She appeared in Jeffy's Cellphone! where Jeffy called her.
In "The Love Potion!", she appears as Britknee and is a 2nd grader. She was boyfriends with Jeffy, and constantly rejected Junior because she thought he was disgusting, likely because he's a Koopa.