Taylor Swift likes to bring her famous friends on the road, but recently she has included non-musicians on her 1989 World Tour. The singer had her “Bad Blood” co-stars Cara Delevingne and Mariska Hargitay join her onstage on Friday.

In Philadelphia, Swift fans were delighted to see the “Law & Order: SVU” and “Paper Towns” stars come out while the singer performed “Style.” Hargitay, 51, and Delevingne, 22, strutted down a catwalk behind Swift, 25, while she sang the hit. They aren’t the first “Bad Blood” co-stars to join Swift onstage though. She had Martha Hunt and GiGi Hadid join her at a show in Detroit last month, according to People

Watch Hargitay and Delevingne strut their stuff below:

Hargitay wasn’t done after one night, though. It seems the mother of three stuck around Philadelphia and joined Swift for her Saturday show too. Check out her second appearance below:

It seems the fun continued backstage as well. Swift introduced her cat Olivia Benson to Hargitay (the cat is named after her “Law & Order: SVU” character). The singer posted a video of Hargitay feeding the feline.

If Swift’s audiences are lucky, those might not be the actress’ only two appearances on the 1989 World Tour. Hargitay tweeted about the experience and said she was tempted to join the “Shake It Off” singer’s tour.

Swift is known for bringing out celebrity friends while she is on tour. In the past she has played with Usher, Jennifer Lopez and even Katy Perry. Fans at Friday night’s show in Philadelphia also saw Echosmith perform their single “Cool Kids” with Swift, while Saturday night’s show featured Rachel Platten performing “Fight Song.”