The two were all smiles as they were dancing along to the brothers' song, 'Tonight.'
Swift and Jonas briefly dated back in 2008.
Nick Jonas and Priyanka Chopra were also in attendance.
Joe Jonas turned 30 years old on Thursday, and his wife was on hand to celebrate.
Joe gushed that he 'couldn't have asked for a better night.'
The actress also discussed how she'll feel reuniting with the cast one last time at the Emmys.
Also, check out the birthday messages from Joe's brothers!
Chopra dished that the family entourage was 60-strong at the Jonas Brothers' Miami tour opener!
The 29-year-old singer is opening up for the boy band on their tour.
Also, see the girls rocking out to their husbands' music in the crowd!
Take a look at the couple's new adorable pet!
Joe and Sophie paid tribute to the loss of their dog, Waldo Picasso.
The couple is paying tribute to their furry friend, who was killed last week in an accident in New York City.
The couple's dog, Waldo, was reportedly killed by a car earlier this week.
