|Ethnic Group||Italian Americans|
|Appearance||Slender, fair skin, blonde hair, blue eyes, pink jacket and pents, pink and white shirts|
|Friends||Cindy Vortex, Courtney Tyler, Libby Folfax, Amber, Nick Dean, Jimmy Neutron, Sheen Estevez, Carl Wheezer, Goddard, Nissa, Betty Quinlan, Tina Sue|
|Enemies||King Goobot V, Ooblar|
|Likes||Popularity, dancing, music, her midriff shirt, Nick, throwing pies at people's faces|
|Dislikes||Being falsely accused|
|First Appearance||Jimmy Neutron: Boy Genius|
|Voice Actor||Candi Milo|
Britney Tenelli is Cindy's other best friend and Nick's female counterpart. She can dance well, as she is seen dancing with Cindy and Libby as a third partner and hanging out with them in many episodes, but usually appears as a background character. She bribed Libby to be her science partner with a music CD in Raise the Oozy Scab. She is a parody of Britney Spears as witnessed in See Jimmy Run when Cindy accused her of sabotaging Cindy's jump rope and she replied "Um, I didn't do it!"
Britney is of similar height to Cindy and Libby. She has green eyes and blond hair which is in long pigtails. She wears pink pants with white and pink waistbands, a pink jacket, a white and pink shirt that exposes her bare midriff, and pink and white shoes similar to Cindy's. In the movie, she can be seen wearing bracelets on both of her arms.