07/11/2013 11:40 EDT | Updated 07/12/2013 04:33 EDT

Kate Upton's Boobs Make Appearance In New Sports Illustrated Behind-The-Scenes Video

Thought you heard the last of Kate Upton? Think again!

The well-endowed "Cat Daddy" star showed off her boobs (natch) in a newly released behind-the-scenes video for her second Sports Illustrated cover.

Frolicking in icy cold waters, the 21-year-old model showed off her incredible stamina (who else could wear tiny bikinis in the Arctic??) while posing for the photo shoot, which hilariously was shot by bundled up photographers. If we were Kate, we would definitely request that the Sports Illustrated staff be required to strip down into their skivvies too!

Not that the Vogue covergirl's work ethic went unnoticed –a worker on set gushed about his new crush saying "Kate is superhuman. She’s insane," after the Terry Richardson-fave went half-naked in freezing cold temperatures.

But the blond bombshell isn't just a perfectionist when it comes to taking it (mostly) off in the cold; the supermodel du jour is also a pro at modeling her assets on the beach (with Cameron Diaz no less) and showing off those gorgeous 20-something legs while shooting her new film "The Other Woman."

Oh, Kate. Even when you're barefaced you still look gorge!

Such a hottie:

Kate Upton's Hottest Photos