Also on her birthday, Perry guest hosted The Ellen DeGeneres Show.
"Right now Ellen is filling in for me. She's at home breastfeeding my child," Perry joked on the show.
The pop star also opened up about motherhood.
"It's an experience unlike any other," Perry said of being a mom. "Now that I'm a mom my life is actually kind of totally different. And yet I realized, it's kind of similar to being a pop star. You're up all night, usually holding a bottle of some kind. There's vomit on the floor. And your boobs are always out."