This is singer-songwriter Maria Antónia Sampaio Rosa AKA Mia Rose, who is wildly popular on YouTube but perhaps you haven't heard of her. She's 21, she's insanely lovely and she has a beautiful voice. This song, What Would Christmas Be Like, is quite a nice little holiday ditty with a California sort of feel to it. This is on my iPod Christmas mix. Enjoy.
Buy it on her website