In a BBC Radio 1 interview with Nick Grimshaw and Ed Sheeran, Taylor Swift talks about petting The Weeknd's hair at Sam Smith's Grammy's afterparty. From 2:20-3:00 (start at 1:00 if you want the entire recap of their Grammy's night).
Taylor: I woke up to an e-mail from The Weeknd, and he was like you told me how beautiful I was for like 15 minutes straight and started to pet my hair.
Ed: His hair is very pattable.
Taylor: It looked really cool that night and I apparently went on and on about it.
Nick: This sounds like quite the evening. You petted The Weeknd. Like an animal.
Taylor: I was like "You're so magnificent."
Nick: Is that the weirdest e-mail that you've ever woken up to Taylor, or has there been other ones than The Weeknd saying "Hey, last night you petted me like an animal."
Taylor: There's been weirder ones than that.
Then Ed talks about a boring story that's not weirder than Taylor's, and Taylor talks about being stalked by people (actually interesting - Ed and Nick joke about it being romantic and Taylor's not having it).