"Really proud of ourselves over here," Taylor Instagrammed alongside a picture of the trio with their own version of Frosty.
And check out Austin's cute pose!
This, of course, isn't the first time Taylor has let her love of snowmen be known. She memorably dressed up as Frozen's Olaf on Halloween, when she sang "Let It Go" with singer Idina Menzel at her show in Tampa Bay, Florida.
So, is the family-friendly Swift time another sign that things are getting super serious between Tayvin? After first stepping out together in March, the two are obviously still going strong. Just last Sunday, they celebrated Taylor's 26th birthday at Apple exec Jimmy Iovine's family Christmas party. A source told ET that a cake was brought out for both the pop star and Jimmy's daughter, Jessica, who also celebrated a birthday that same day.
No word yet on what Taylor and Calvin will be up to on New Year's Eve, though the singer is premiering her highly anticipated music video for "Out of the Woods" during Dick Clark's New Year's Rockin' Eve With Ryan Seacrest on Dec. 31.