Taylor Swift supports Calvin Harris at DJ gig in Las Vegas, parties with her friends at Omnia

Taylor Swift had a busy weekend, both attending Reese Witherspoon’s 40th birthday party and giving a private performance as well as supporting boyfriend Calvin Harris at his Las Vegas gig at Caesar Palace's Omnia nightclub.

Swift had dinner with friends at Spago in Beverly Hills on Friday, March 18 and a few hours later, she was in Vegas with Karlie Kloss, her brother Austin Swift and the girls of HAIM partying at Omnia.

ETOnline reports Swift wasn’t far from Harris during his performance, dancing along in his DJ booth with her friends and family.

The following night, she was at Reese Witherspoon’s birthday party in California, performing an acoustic version of “Shake It Off" for A-list guests like Jennifer Aniston, Robert Downey Jr. and Kate Hudson.

Swift and Harris recently marked their one-year anniversary as a couple, and they also shared photos from a romantic vacation they took last week.