Chris Hemsworth's long-time personal assistant and childhood friend Aaron Grist shared some awkward throwback photos of the Thor star to mark the Hollywood star's 39th birthday on Thursday. Aaron posted some never before seen images to Instagram of a pre-fame Chris, proving even the hunky Marvel action star had an awkward growth phase. In one photo, a teenage Chris is seen with acne and daggy hair while dolled up in a tuxedo to attend his school formal.