Credit: Alo Ceballos/FilmMagic;

Part of their world! 

Kim and Kourtney Kardashian took Mason Disick to the aquarium in Mystic, Connecticut on Thursday, and the trio got up close and personal with marine life.

"We touched penguins, sharks, sea lions and even a whale!" Kris Humphries' wife tweeted excitedly. The 30-year-old newlywed also posted a Twitpic of herself kissing a seahorse. "All I want for Christmas is a seahorse!" she explained. "I've always wanted one."

Kourtney, 32, enjoyed her time at the aquarium as well. "Thanks for the memories Mystic, Connecticut," she tweeted. "The aquarium and seaport were very special. Kim and I enjoyed." 

Earlier in the day, Mason's mom quipped: "Can't I just wear my pajamas all day?"

Kourtney, boyfriend Scott Disick and their 21-month-old, Mason, are living in New York while filming Kourtney and Kim Take New York. Kim moved permanently to the east coast because of Humphries' position on the New Jersey Nets basketball team.