"I love being with her. She makes me a better person," Ashton Kutcher, 27, says about Demi Moore, 42, his girlfriend of two years. "We work together on life every day." They share a devotion to Kabbalah – and to Moore's daughters, Rumer, 16, Scout, 13, and Tallulah, 11. And though they won't comment on it, buzz has been building that they soon could take their relationship to the altar.