You can totally tell Jazmyn and Jaxon Bieber love their big brother. In the vid, they belt out the tune's infamous, catchy hook and even throw in some dance moves. Cute!
Of course, Justin's dad Jeremy is the one who posted the clip on Vine. Jax is the one in the middle, busting out his inner JB. Is that a table they're standing on? A Bob Marley tapestry in the background? Anyway...
Watch the adorable moment below, and then you can click here to catch Justin doing the same thing, lip-syncing to Fergie's "Big Girls Don't Cry". We're guessing it runs in the family.
Can you even imagine having a sibling as famous at the Biebs? #TheLife