Taylor Swift and Calvin Harris attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nev.

After spending some time in a winter wonderland (Colorado) the last few days, Taylor Swift and boyfriend Calvin Harris celebrated the New Year together at Harris' New Year's Eve show in Las Vegas.

Swift -- who premiered her "Out of the Woods" video earlier in the evening -- cheered on Harris as he deejayed at the OMNIA nightclub in Las Vegas.

Taylor Swift Releases 'Out of the Woods' Video

Swift, who of course is a known enthusiastic audience member, danced along to the music, as several fans' photos from the event show.

HQ photos of Taylor at Omnia in Last Vegas last night on NYE (supporting Calvin Harris) https://t.co/ChfkkqAjvY pic.twitter.com/nVKiCzoTHj — TSWIFTDAILY (@tswiftdaily13) January 1, 2016

Orange is the New Black actress Ruby Rose also posted an Instagram of herself with Swift (plus tiaras) at the show.