The holidays may be over but many stars are still on vacation and making us supremely jealous with all of their sand and snow pics.

First up, can you guess which celeb is pulling off this incredible headstand? Believe it or not, it's Katie Couric! The journalist -- who turns 56 on Monday -- looks amazing. Are headstands the secret?

Mario Lopez's adorable 2-year-old Gia provides some breakfast entertainment, while Rob Lowe and his (equally handsome) son hit the slopes.

Plus, Ozzy Osbourne is a beaming grandpa with baby Pearl, Ludacris gets a sweet new ride for the new year, and Snooki shares a family photo.

See the pics these celebs and more shared this week!


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