The 26-year-old Avengers: Age of Ultron actress shared a story with Late Late Show host James Corden on Thursday about how she showed up to a friend's birthday party, which the "Shake It Off" singer also attended. Only, Olsen didn't make the best first impression.
"I really love her, and earlier in my ballet class, I was doing a dance sequence to her music," she said of Swift. "I only listen to her music when I'm working out, which is a little too often because of Avengers."
So, why didn't the girls didn't hit it off?
"And I just talked at her for like a long time. I think I blew it because we didn't exchange phone numbers or anything," Olsen admitted, revealing that her nerves got the best of her.
"She was asking me which song it was, and I couldn't remember the song title, and I wasn't going to sing it for her! I'm still nervous thinking about it right now."