And what did Ariana's brother, Frankie, get the singer? While we're waiting on confirmation from her on social media, take a look at what Frankie said in a recent interview. What do you get the girl who has everything? Something that appeals to her love of animals, of course.
Frankie told MTV: "I've been recently thinking that I'm going to rescue an animal in her name - for the girl who has everything, I give you love, like 'NSYNC said."
He further explained, "[Animal rescue] is something...really close to her...This year she inspired me by rescuing a cow so maybe you just gave me an idea so now I'm going to rescue a cow."
And, as a gift to fans, Ariana and Frankie made a video answering a lot of fans' Twitter questions, including their adorable inside joke.
UPDATE: Frankie did get Ariana a cow...and a goat too!