This upbeat holiday collection from the holiday-oriented supergroup brims with cheerful harmonies and hand-clapping breakdowns, from chirpy opener "Snow Snow Snow" to twangy, thumping "Auld Lang Syne." Originals and covers alike shine with slick production, most notably on "Wishlist," in which Natasha Bedingfield coyly proposes to "be your naughty and nice," and the minimalist, R&B-touched "O Holy Night," where David Ryan Harris and Alex & Sierra deliver spine-tingling a cappella harmonies. "Holiday in L.A." may be the real winner: It's the sunniest Christmas tune since "Mele Kalikimaka."