6. Reese Witherspoon & Carrie Underwood
Reese Witherspoon and Carrie Underwood could easily pass for sisters, with their blonde hair and dazzling smiles. A fan once mistook Witherspoon for Underwood in a parking lot, a moment she proudly tweeted about.
Underwood quickly responded, saying it made her whole life. Their wholesome charm and bubbly personalities make the resemblance even stronger. For fans, this mix-up is always a sweet one.