Selena Gomez just premiered her new movie Hotel Transylvania, and she walked the red carpet with two surprising guests – Justin Bieber's little brother and sister!

Selena carried Jaxon to the movie, and brought Jazym along too. It was a really cute way to give her boyfriend's siblings a special treat.

She wore a pretty black dress for the movie's official premiere.

Aww, what a nice thing to do for Jaxon and Jazmyn!

Sources: Just Jared Jr., Beautiful Ballad