John Legend and Chrissy Teigen welcomed their long-awaited firstborn on Thursday, reports People, a daughter the couple named Luna Simone Stephens. Teigen and Legend announced her birth on Sunday via social media, with Teigen posting a photo of her daughter's weight and date of birth to Instagram: "She's here! Luna Simone Stephens, we are so in love with you!" Legend tweeted, "Our new love is here! ... We couldn't be happier!" Teigen's pregnancy, which was conceived via IVF after the couple faced fertility issues, was not without controversy after she admitted they picked a female embryo. (More celebrity baby stories.)