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 kept the promotional ball rolling in Las Vegas Wednesday night at the Sports Illustrated Swimsuit Issue party.
Of all places to dress demure!
Whatevs, we can't really complain because Kate really does look great!
Do U agree???
[Image via Judy Eddy/WENN.]