A slew of celebrities and musicians came together to toast America's teachers during a "Teachers Rock" concert broadcast on CBS Friday night. The concert featured singers such as Carrie Underwood, who delightfully shared with the audience that her mother, who taught her in school, was occasionally called "Mrs. Underwear" by her classmates. Underwood was joined by Garth Brooks, Maggie Gyllenhaal, Morgan Freeman, Adam Levine, Dave Grohl, Meryl Streep and others, sharing songs and testimonials. One of the teachers who was highlighted was Shella Condino, whose Presidio Rocketry Team was given a special shout-out by President Obama at February's White House Science Fair.