Sheryl Crow is joining the preschool set in her voice role on Nick Jr. show "Julius Jr." The mom of two boys, ages 5 and 8, will lend vocals to the character Sheryl Butterflow, who also happens to be a butterfly. The episode airs on Sunday, August 9 at 10 a.m. on Nick Jr. Crow also recorded an original song for the series, which will air during the episode and be available as a single on iTunes after the episode airs. Check out our exclusive behind-the-scenes clip of Crow — and Butterflow — in action!