Upton, whose racy Antarctic photo shoot landed her the much-coveted cover of SI's swimsuit issue for the second year in a row, is finding fame a little ... icy.
According to Us Weekly, the 20-year-old blonde bombshell's fellow pinups are not the biggest fans of the mag's Kate Upton photos - or the model herself.
"The SI models hate her," an insider tells the celebrity news magazine of the voluptuous cover girl. "They are jealous, but Kate's also been a bitch to them."
In fact, relations are so chilly between Upton and the other models that they won't socialize with one another even when they're sitting just a few feet apart.
At a 1Oak party in Las Vegas on February 14, right after the cover's release, Upton kept to herself as the rest of the ladies chatted among themselves.
"She didn't interact with anyone," an onlooker says. "She wasn't friendly."
Is this fact or gossip? It's hard to say, but for what it's worth, SI stunner (and former cover girl) Brooklyn Decker was very congratulatory toward Kate.
Haters will be haters, but she likely has more than a few fans as well - and we're not talking purely about straight guys who drool over her pics.
Speaking of which, we've got a bunch, so browse away fellas