The mum-to-be posted the photos on her Celebuzz website from a trip to Miami where she went to meet some dolphins at the aquarium.
Kim tweeted with the photos: "I made a new friend in Miami."
The 32-year-old looked chuffed to be making a new pal and can be seen shaking the dolphin's fin, all while striking a pose and staying glam.
Kim was dressed more casual than we're used to seeing, as she opted for a black maxi dress and blazer.
Another snap shows Kim striking a memorable pose and glancing at the dolphin as if they are about to synchronize a new routine together!
Kim's sister Kourtney was there too, and got in on the action by stroking the dolphin poolside with the trainer, while her boyfriend Scott Disick watched from a distance.
Kim and Kourtney temporarily relocated to Miami from Los Angeles to film their upcoming reality show Kourtney And Kim Take Miami!, but took time out from work to get acquainted with what the city has to offer.
Kim and her boyfriend, American rapper Kanye West, 35, announced they are expecting a baby this week.
> Kim Kardashian pregnant: will her baby be on TV?
> Kim Kardashian: 'Pregnancy isn't as easy as people think'
Celebrities congratulate pregnant Kim in our gallery below!