Just a day after attending a bridal shower ahead of her upcoming wedding to Kanye West, Kim Kardashian posted a photo celebrating her first Mother's Day with the couple's nearly 1-year-old daughter, North West. "This little girl has changed my world in more ways than I ever could have imagined!" she wrote on a post to her Instagram. "Being a mom is the most rewarding feeling in the world! Happy Mothers Day to all of the moms out there!"