Carrie Underwood's 4-year-old son, Isaiah, may just have his first crush and it's on an older lady. It looks like his heart belongs to Maddie Marlow from Maddie & Tae. "This morning my 4-year-old, who hates wearing jeans, asked to wear jeans so he could 'look cute for Maddie'," Carrie tweeted. "He also asked me to fix his hair and to get him some flowers that he could give to her. Don't you break his heart Maddie Marlow!" Maddie responded on Twitter as well, saying, "I seriously could've cried. My heart just about exploded. Y'all raised the sweetest boy! Goes to show what a great example you and your hubby set for your boys." She also included the hashtag "new tour boyfriend".