The Best Celeb Instagrams of the Week (Including Ariana Grande and Big Sean's Cutest Selfie Yet)

You know the drill: Another week, another roundup of the best Instagram pictures your favorite stars posted throughout the past week. And though we don’t know how they do it, somehow the snaps just keep getting better and better and better.

This time there’s a little bit of everything, from a musician vs. model nerf fight to an envy-inducing puppy cuddle session. (We’re looking at you, Demi!) And of course that selfie of Ariana Grande and Big Sean that has everyone saying awwww. Really. Everyone. Even you.

So what are you waiting for? Scroll down through our faves below!

Demi Lovato

That face. Can we babysit sometime pleaaase?

Liam Payne

Raise your hand if you think Liam should post more selfies. [Enthusiastically raises hand.]

Ariana Grande

You said awwww, didn’t you? Told ya.

Perrie Edwards

Now this is how you get pumped up to see Cats.

Lorde

Christmas Cards 101.

Cara Delevingne

First modeling, acting, and singing...now NASA?

Olivia Holt

Olivia and Garrett took full advantage of being the stars of this show.

Justin Bieber

Nerf fights = the best fights.

Fifth Harmony

Ornaments on top of your head, on a treewhatever works.

Karlie Kloss

Now this is a girl who knows what she’s doin’.

Which Instagram was your favorite this week? Tell us below!