These twin 4-year-old girls totally rock! Maddie and Zoe's favorite movie is Disney's 'Frozen' and they had no problems belting out one of the songs from the movie, 'Let It Go.'  On another note, Frozen is just the fourth animated film soundtrack to ever hit #1 on the Billboard 200.  The soundtrack sold another 165,000 copies this week to land at the #1 spot ahead of Beyonce's self titled album.