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Twinsies! Taylor Swift and her brother look like they got up to some good old fashioned holiday fun this Christmas. The Grammy winner posted an Instagram pic of herself and younger brother Austin wearing matching plaid onesies on Christmas Eve.

"Matching Christmas onesies is a thing that's happening right now," wrote the 24 year old.

Umm we want a Christmas onesie -- they looks so comfy and warm and our offices are a bit chilly this winter morning!

While Austin added an extra Santa's cap to his jammies, Taylor topped her plaid present with a furry hat, her perfectly coiffed tresses peeking out.

Looks like another fun night in the Swift house!