Kate Upton looked stunning and hot as she was spotted going out after her sweaty gym session. The Sports Illustrated supermodel's trainer was even caught looking at her famous derriere.

In a report by The Daily Mail, 23-year-old Kate Upton was seen going out of her local gym in West Hollywood, California looking her usual hot self as she wore a gray fitted sweaty shirt.

Kate Upton looked exhausted but glowing. She completed her outfit for the day with a pair of skin-tight pink leggings and black trainers.

"The Other Woman" actress opted to tie her long blond locks in a messy bun as she decided to go with no makeup at all.

The Sports Illustrated model was also pictured inside the Rise Movement gym in Melrose Avenue with her personal trainer while she was doing squats.

In one photo, Kate Upton's trainer seemed to admire the hot supermodel's derriere as he was seen looking at her behind while she was doing her rigorous training.

Kate Upton's trainer Justin Gelband previously told Shape magazine that the model is doing a number of fitness activities to maintain her curves.

The trainer said that Kate Upton's hot body can be credited to Zumba, Pilates, yoga, and Capoeira.

In an interview with E! Online, Kate Upton said that she has insecurities but she accepts the body that she has.

"Every person has insecurities," she said. "But this is the body I was given, I appreciate it and I try to take care of it every day as best I can, but I always enjoy my life."

Dubbed as the "Sexiest Woman Alive" of 2014, Kate Upton is considered as one of Forbes' highest-paid supermodels in the world. She has also been the face of a number of top brands such as Bobbi Brown. Currently, the model is the ambassador of hit video game "Game of War: Fire Age."

While she is busy doing photoshoots and doing runway walks, the model is balancing work and relationship with her boyfriend of two years, Detroit Tiger's pitcher Justin Verlander.