"I will sing in my films, but I want her to sing in them as well. So, as much as I want to sing every day, I don't want my sister to hate me. I want her to sing with my friend Parson James at my birthday. I'll be 30 this year, and I want her to sing at it. I'm scared to ask her. She's so kind of nervous about it, but she's really good,” she said.