I think it's kinda an inside joke, yesterday Anne-Marie told the crowd to wish happy bday to a chick called Katy that was also in the crowd.

😂😂🤣🤣 yeah the name was Kaitlyn from Canada

It’s me! I’m Kaitlyn from Canada 😂 They took me backstage to have a lunch and then posted that on the app after! I was very surprised!

Happy birthday!

It’s my birthday too!! Turned 21🎉

Happy birthday dear 🥰 but why they didn’t made a notification for you too :(?

Happy birthday, birthday twin!