Just when I thought I'd seen every cover of "Let It Go" in the known universe, American Idol comes through with what might be the best (and the cutest) version. It's so sweet that it even made JLo cry. During the auditions of the 14th season of American Idol, 23-year-old mom Kelley Kime was joined on stage by her adorable 3-year-old daughter, Hope. The single mom's Idol dream started off on a high note, when right before Kelly started to do her audition, her daughter sang "Let it Go" from Disney's Frozen. The little girl's performance amazed the judges so...