It was a Twit pic-filled Christmas for many of the nation's top celebrities.
First, Jessica Simpson confirmed her second pregnancy via an adorable shot of her daughter Maxwell in front a sand-scrawled message that reads "Big Sis."
Then, Vanessa Hudgens and Ashley Tisdale posed as a pair of sexy Santa helpers and wished fans a merry holiday.
Now, Justin Bieber has made followers melt with an Instragram image of himself and his self-labeled "luv." No, not Selena Gomez. Justin's little sister!
The Biebs spent the holiday with family in Canada.
And by being the best big brother that nation has ever seen, of course. Just another reason Justin Bieber is considered Celebrity of the Year #5!