Neil Diamond surprises audience with 'Sweet Caroline' performance at Broadway opening of 'A Beautiful Noise'

According to journalist Lia Beck and Yahoo! Life, "In the 1970s, Leif Garrett came to fame as a teenage actor on shows including Three for the Road, Family, and The Odd Couple. From there, he launched a successful singing career—though it wasn't always his voice on those recordings—and was a fixture in Tiger Beat magazine and on the walls of his teen fans. But, in the years since Garrett was a teen idol, he has been through hard times, including drug addiction and legal problems. Now 60 years old, the actor has opened up about his struggles and his career in a memoir and in interviews."