Katy Perry shows fans her pregnant belly button: 'Wanna see something gross?'

After posing the question, the "Teenage Dream" singer and mom-to-be showed a video on her Instagram Stories featuring an extreme close-up of her baby bump — with a fully distended belly button. It's not something that happens to every pregnant woman, according to the Cleveland Clinic. "Sometimes a growing baby in the uterus can put so much pressure on a woman's abdominal wall that her normally 'innie' belly button becomes an 'outie,'" it explained.