During her Aug. 7 concert at Los Angeles' Kia Forum, Gracie Abrams brought out her best friend and "favorite artist in the world," Audrey Hobert.

"I wanted to sing a song for you that I’ll forever wish I wrote, if you’ve got 10 minutes," she told the crowd ...

The performance comes about eight months after Swift’s global Eras trek wrapped after two years in December, with Abrams ...