But perhaps the sweetest message came from the biggest Arianator of all, her bae Mac Miller.
The rapper took to Instagram to share a cute coupley snap of the pair and gushed about his lover in a lengthy Instagram caption.
"Happy Birthday to this adorable pure soul who has reminded me what being happy feels like," he wrote.
He added: "Thank you for loving me so good. I think it's supposed to be 'so well' but I don't care. I love you and can't wait for all of the adventures."
If that's not real love, we bloody well don't know what is!