Harry has 'followed' Ariana on Instagram, which might not be a big deal to most, but to Harry, it is - and fans are freaking out.
Arianators have very quickly developed theories about what this could possibly mean.
Does this mean a collab is in the works? Of course, it's not the first time the two have worked together professionally. Ariana's hit song "Just A Little Bit Of Your Heart" was actually written by Harry in 2014, with him singing it on his tour in 2018.