The "Law & Order" star aptly called her a "boss lady."

The Gist

Mariska Hargitay called Taylor Swift a "boss lady" on the latest "Call Her Daddy" episode.
"It was the most fun ever," she said of attending the 2015 VMAs with Swift.
Hargitay appeared in Swift's "Bad Blood" music video.

Mariska Hargitay is finally opening up about working with Taylor Swift on her "Bad Blood" music video. The Law & Order: Special Victims Unit star appeared on the most recent episode of "Call Her Daddy," where she sang "boss lady" Swift's praises.

“It was so fun. It’s the best music video,” Hargitay told host Alex Cooper.

Swift's "Bad Blood" visualizer featured a star-studded cast—many of whom were also her real-life besties. Selena Gomez, Gigi Hadid, Karlie Kloss, Ellen Pompeo, and more make appearances.

Hargitay also described how "cool" it was attending the 2015 MTV Video Music Awards with the entire cast. She and Hadid, Kloss, Gomez even took the stage with Swift when she won the Moonman for Video of the Year.

“That was the most fun, being in the squad with all the cool girls and supermodels," Hargitay said. "It was the most fun ever."

Getty Gigi Hadid, Martha Hunt, Hailee Steinfeld, Cara Delevingne, Selena Gomez, Taylor Swift, Serayah, Lily Aldridge, Mariska Hargitay, and Karlie Kloss at the 2015 MTV Video Music Awards.

As for filming the music video itself, Hargitay called the experience "so great."

"[Taylor] was just warm and smart and kind and such a boss lady,” she said of Swift. “I learned so much from her. That's what I love about her. She's so young, but she shows us in such beautiful ways how to be fearless and a boss lady."

Hargitay is a proven Swiftie: not only did she take the stage with the "Karma" singer back in 2015, but she and her daughter Amaya attended the premiere of Swift's Eras Tour concert film. The feeling is certainly mutual, as Swift famously named her cat after Hargitay's iconic SVU character, Olivia Benson.