The latest "Bad Blood " reunion is giving us mad love.

Taylor Swift surprised the crowd at her 1989 Tour in Philadelphia Friday by bringing her pals Mariska Hargitay and Cara Delevingne on stage. The singer said on Instagram she "couldn't even contain" her happiness:

In another shot, Swift's "Bad Blood" music video co-stars can't even contain their dance moves as they all rock out:

Cara Delevingne also celebrated the event on Instagram, posting a photo with the caption: "Speechless :"