- “Oh, yeah, like I'd be seen with a Discover card.”
- ―Alex Whitney
Alexandra "Alex" Whitney is a popular "grown-up" girl in Lisa's class. Lisa becomes very jealous of her, because Alex steals her friends.
Alex is quite a "mature" girl for her age. She has a mobile phone, purse, credit card and enjoys dances. She pierces her and her friends' ears with the help of thumb tacks and a whole lot of paper towels. She enjoys shopping on credit and dating. Her favorite scent is Calvin Klein's Pretension and favorite drink is iced tea. She uses valley girl slang, which is mainly used by teenage girls. She mentions her parents are extremely rich. She always has lip gloss, perfume and a spare pair of platform shoes in her pink fuzzy back pack. 
Alex has shoulder-length blonde hair and typically wears nice clothes, shoes, and jewelry.
- In "Little Girl in the Big Ten", Alex has miscolored brown hair instead of blonde hair.
Behind the Laughter
In "Lard of the Dance", Alex Whitney is voiced by Lisa Kudrow, who acted as the role of Phoebe in the sitcom Friends. Coincidentally, she also tells Lisa at one point to "not be such a Phoebe", a reference to the character she portrays on Friends.
Most of Alex's appearances are brief, background notes. The episodes where she had an actual role are in bold.
- Episode – "Lard of the Dance"
- Episode – "Last Tap Dance in Springfield"
- Episode – "Treehouse of Horror XII"
- Episode – "Little Girl in the Big Ten" (has brown hair)
- Episode – "My Fair Laddy"
- Episode – "White Christmas Blues" (Seen at Santa's Tavern and at The Art of Slingshot)
- Comic book – Children off the Cob
- Comic book – The Mystery of The Pesky Desk
- Comic book – Wedgie Issue