Since her 2010 split with Jesse James, Sandra Bullock has been single—and happy. Raising adopted son Louis, now 2, solo has been inspiring. "He calls me 'mama,' and it gives you a sense of power," the 46-year-old actress told OnTheRedCarpet.com. "It breaks your heart and opens it up in the best way. ... I just can't even explain. But I think everyone who has a child knows what it feels like. It makes you a better person."