Sara Sampaio complains about how her 'back hurts' after donning huge fake breasts for Halloween

Sara Sampaio is paying the price for dressing up as Chimp Crazy star Tonia Haddix for Halloween.

The top model took to her Instagram page on Friday, the day after the creepy and creative holiday, and shared a series of snaps, along with a couple of videos of her all decked out in her Chimp Crazy costume.

'All I can I say is that my back hurts #halloween,' Sampaio, 33, revealed in the caption of her post.

She would also enlist the help of actress and friend Georgie Flores, who played her primate side kick Tonka, while dressed up in a chimp suit.

For her costume, Sampaio slipped into a pink minidress underneath a sheer pink robe-like top with pink furry trim on the sleeves and bottom portion, along with her huge fake breasts and long blonde wig.

The two ladies were spotted while out and about partying on the Halloween holiday on Thursday, where they stayed in character most of the time, but there were times when Flores lifted her mask up for a breather.

The catwalk queen also shared a bunch of pictures on social media that included her replicating the Chimp Crazy promotional photo, which is also where she got the inspiration for her light pink ensemble and blonde wig.

They proceeded to pose for a number of photos together in full costume, including one of Sampaio laying out on a floor, and another of Flores as Tonka snuggling up to his human friend.

The Portugal native also struck a pose as Haddix and an abundance of attitude while sitting in a living room.

Then the Famous In Love star jumped into the mix and sat on her bestie's pal for another pose together for the camera.

The star of the Halloween post would also give some behind-the-scenes looks at her costume and how she put it all together with such massive breasts.

One of them shows her standing in front of a full mirror shortly after putting on the fake boobs and then rubbing them with both hands and then jumping up and down.

'Oh my God I look like a disaster,' Sampaio says in another clip of herself after getting in to full costume, all while holding up her camera phone.

From there, she again starts to slightly move up and down to make her breasts jiggle, which got a laugh from the model and her gal pal. 

A third video captured the longtime Victoria's Secret Angel grabbing at her plastic breasts repeatedly as she made her way around the Halloween party with the music pumping.  

Sampaio was first discovered at the age of 15, though she was not allowed to compete in modeling competitions until the age of 16.

After finishing high school, she went on to reach her goal of working with VS when she walked the runway at the 2013 Victoria's Secret Fashion Show for the first time.

She has since gone on to work with many of the top fashion outlets, companies, and photographers, en route to becoming one of the top models in the world.

The HBO documentary, Chimp Crazy, premiered on HBO on August 18, and follows Tonia Haddix, whose love for a chimpanzee Tonka spins into a wild game with authorities and the animal rights group PETA.