Kim Kardashian arrives at JFK airport in New York City on March 25, 2013. Credit: XPOSUREPHOTOS.COM

Even Kim Kardashian is shocked by her latest fashion choice. Arriving in New York City on Monday, March 25, the five-months-pregnant reality star was missing one of her favorite accessories -- her signature stilettos. On her feet instead were sensible (but still cute!) black ballet flats, which she paired with black leggings and a full-skirted black-and-white coat.

"I never thought I would ever say this...But I'm wearing flats today," the 32-year-old mom-to-be tweeted of her surprising sartorial decision.

Until now, Kardashian -- expecting her first child with boyfriend Kanye West in July -- has seemed to prioritize style over comfort where maternity wear is concerned. "I feel my best when I am in heels and chic clothes!" she explained on her blog. "Happy mommy, happy baby!"

The comment was part of a post defending some of the star's recent wardrobe choices, which include a leather pencil skirt and fur stole. "I felt so good in this look. So me!" she wrote of the outfit. "But then I saw some comments that were so critical!"

"It's funny because Kourtney warned me that when I get pregnant, people's opinions will be on an all-time high and everyone will chime in!" she continued. "So I now see what she means."