Katy Perry opened up about raising her baby girl for the first time since giving birth in August.“Popular misconception: being a mom isn’t a full-time job,” the Grammy nominee, 35, tweeted on Thursday, September 24. “When a mom finally goes back to work (whatever profession they do) it’s not like [she is] coming from months of ‘time off.’ She’s coming from a full-time job … of being a mom, lol.