Cody Simpson

As the new heirs to the Justin Bieber/Selena Gomez teen power couple throne, 15-year-old Aussie singer Cody Simpson and 14-year-old lil Kardashian Kylie Jenner enjoyed a movie date night at The Grove in L.A. on Tuesday. Watch your ass Jelena ... or Gober ... Bomez ... whatever.

Cody Simpson was the big guest star on the very first episode of the "Sonny With a Chance" spin-off show "So Random!" -- but you wouldn't know it from his paycheck. "So Random!" premiered last June as its own show once "SWAC" went off the air following Demi Lovato's departure. Cody was the musical…