Danica McKellar — in 1988 and 2012
On The Wonder Years, Kevin Arnold had every reason to crush on Winnie Cooper, played by Danica McKellar — the little lady was as sweet as she was adorable! Well, Danica has proven she's not just another pretty face — she's wicked smart, too! Danica went on to study mathamatics at UCLA and graduated summa cum laude. She wrote three cheekily-titled books about math in an effort to get young women more interested in and confident with math, and all three made it to the New York Times children's bestseller list. Impressed yet? Danica's combination of beauty and brains makes the 37-year-old a total package worth expontential girl crushes.