Watch Christina Aguilera Sing to Son Max

Christina Aguilera 's Rock the Vote PSA has been released (Watch above). "Being a new mother, it was really important for me to get excited about this election," she told Larry King last month. This election "is such one of change and new development for our country and for the future of my son," she added. "I want the best possibilities for him." ( See photos of Christina's baby bump .) The 27-year-old singer — who would not reveal which candidate she supported — said she registered to vote "as soon as I could" but admitted she didn't "exercise that right until the last election. "As a woman, that's embarrassing that it took [me] so long [to vote] because we weren't always given that right," she said. Tell Us : Will Christina's ad make a difference? (link)