Valerie Bertinelli Recalls 'Sobbing' Over Son Wolf's Wembley Stadium Performance (Exclusive)

Valerie Bertinelli and Mackenzie Phillips chat with ET at the red carpet for 'Norman Lear: 100 Years of Music and Laughter,' which airs Sept. 22 on ABC. The actresses open up about how grateful they are to Norman for starting their careers with 'One Day at a Time.' Plus, Valerie praises son Wolf Van Halen's performance at Wembley Stadium.