Simon Cowell, known for his tough exterior, has shown his softer side on "America's Got Talent" on multiple unforgettable occasions.  Here are five poignant moments where the stoic judge couldn't hold back his tears: Evie's Touching Tribute: Thirteen-year-old Evie performed a heartfelt song, revealing her use of music to cope with her father's cancer. Heidi's Intimate Song: Heidi’s deeply personal song about loss resonated with Simon.David’s Heroic Act: David's act involving his dog Finn, who performed a routine symbolizing bravery and loyalty, moved Simon deeply.Michael’s Life Story: Michael, a foster father who sang about his life’s struggles and triumphs, deeply affected Simon. Mel’s Powerful Performance: Mel’s performance, infused with personal stories of struggle and overcoming, struck a chord with Simon.