MTV News was at the Sundance Film Festival to watch it all go down.

The last time that MTV News spoke with Chloë Grace Moretz, it wasn't the best of times for the young actress. She was forced to choose between Britney Spears and Rihanna, a decision that cut her to the core.

When we met back up with her at the Sundance Film Festival a couple weeks ago, the wounds were still fresh but she had moved past the initial shock. Instead of reliving the difficult decision she had to make, Moretz decided to help her "Laggies" co-star and on-screen dad Sam Rockwell learn the difference between the Britney and Rihanna.

Because as cool as Sam Rockwell is, he doesn't know the difference between Britney and Rihanna.

The world's favorite acting and dancing virtuoso isn't quite as hip to popular music as Moretz is, so on a balcony in Park City, Utah, we watched as the two bonded over some Rihanna hits. It was a truly special moment that we get to share with you now.