Caroline Wozniacki covered up all of her wavy blonde locks under a Santa hat a couple days ago, and, unlike some other stars, wisely bowed out of singing/rapping "Jingle Bells" in a WTA "Happy Holidays" clip. (below) But rest assured: She has her fun.

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Wozniacki, still all of 21 years young, has added to her many plaudits with inclusion on one of Forbes magazine's "30 Under 30" lists. Said the mag of Woz: "Outgoing, top-ranked tennis beauty has rich roster of sponsors including Compeed, Turkish Airlines and Sony Ericsson." The only other athletes who appeared on Forbes' broadly based Entertainment roster were NBA baller LeBron James and college quarterback/Heisman Trophy candidate/NFL draft No. 1 bait Andrew Luck.

Other notables who made the cut included actors Donald Glover, Jonah Hill, Jennifer Lawrence, Chloe Moretz, and Jaden Smith.

Here's the landing page for all 12 lists, in the arenas of Art & Design, Music, Social & Mobile, Media, and more, all presented in decidedly "Brady Bunch"-esque fashion.

So, for all of those feeling like underachievers, needing motivation to do well by their new year ... jump on it. One at a time, slay the day in 2012.

—Jonathan Scott (@jonscott9)