While the pair haven't exactly hidden their relationship on social media, this post is nek level.
"Happy birthday to this beautiful girl, 14!!" he wrote on Instagram. "You’re the funniest, most caring person in the entire world. I hope this year brings you lots of great memories and moments you remember forever. Can’t wait to see you, I love you and miss you so much!! Everybody go wish this girl a happy birthday."
PLS REVIVE US.
Sadly for the pair, they can't be together for her b'day, but Millie posted an adorbs post thanking everyone for the birthday wishes, adding a cute little, "I wish I was with you @jacobsartorius missin' you x" at the end of her caption.
Could these two be any more in love?
Fans started speculating about their relationship in mid-Jan when they were spotted hanging out together on New Years Eve, but then they went Insta official a few days later on Millie's story.
And it looks like the rest is history!
Happy birthday MBB!