Leto's mother, Constance, helped the Dallas Buyers Club star celebrate his 2014 Oscar win -- and got a special shout-out during his acceptance speech. "[My mom was]. . . a single mom, but somehow she managed to make a better life for herself and her children. She encouraged her kids to be creative, to work hard and to do something special," he said onstage. "I just want to say, I love you, Mom. Thank you for teaching me to dream."