'Tis the season...for ugly Christmas and holiday-themed sweaters! At this point, ugly Christmas sweaters are no longer the attire of grandmothers and aunts. They are worn by celebs and pop stars, albeit in wink-wink, nudge-nudge fashion.

To get you in the Christmas spirit, we've rounded up snaps of celebs rocking the most hideous, Rudolph and Santa-adorned clothes! We call this photographic evidence.

Justin Bieber donned an ugly, Christmas-style varsity jacket. Not even his hair could save this travesty! But he gets points for being so seasonal.

Andrew H. Walker, Getty Images

Katy Perry took the ugly Christmas sweater to a whole new level. It's not quite a dress, but more like a housecoat. Who let her leave the house in this hot mess? There's no irony here! But her makeup looks amazing and the teal booties are amaze, so it's not a total loss.

Astrid Stawiarz, Getty Images

Not even an ugly reindeer sweater and a Christmas jumper can subtract from the hotness of One Direction's Harry Styles.

Ellie Goulding and Ed Sheeran donned ugly Christmas vests. The talented Brits would make a cute couple in their matching outfits. Oh wait, they sorta were a pair for a minute...

Ariana Grande is still adorbs, even in her ugly fuzzy sweater.

Perrie Edwards of Little Mix can get away with wearing an ugly sweater since she is engaged to Zayn Malik. She already has the best present of all.

Actress Mena Suvari, cats and matching Drummer Boy-themed sweaters. Ew...in a cute way.

Miley Cyrus, her tongue and an oversized Christmas sweater.

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What's worst -- Joe Jonas' porno 'stache or his ugly holiday sweater?

Uh, yeah, we prefer seeing Olympic diver Tom Daley shirtless and swimming over this Christmas shirt any day of the year!

Mariah Carey in a furry Christmas top and her dog in an Xmas sweater... A poorly dressed but surely pampered pup.

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Nathan Sykes of the Wanted is still cute, even in an ugly sweater.