One source claims the 18-year-old was actually bullied for being there -- apparently not everyone thought she earned the right to walk the shows!
The insider spilled:
Kate Upton made a rather leathery arrival at LAX on Wednesday.
To take to the friendly skies, the supermodel went with an all-black look, pairing leggings with knee-high boots, a black top and leather jacket.
Her favorite Celine handbag and Ray-Bans aviators, and million dollar smile were her accessories of choice.
We're sure that smile is her still laughing at the HIGHlarious joke she tweeted earlier this week.
[Image via Ramey Pix.]