Reese Witherspoon, known for her role in "Legally Blonde," seemed thrilled when she was mistaken for Carrie Underwood while running errands in LA. Both women are famous blondes. Witherspoon took to Twitter, saying the encounter made her day. Underwood gained fame as the winner of "American Idol" in 2005 and has had success in country music. Witherspoon recently celebrated Father's Day and praised her husband Jim Toth for being a great dad. She also spoke about her religious beliefs and how they provide her with a sense of peace and purpose.