Celebrity Parents John Legend and Chrissy Teigen Have Been Planning Second Pregnancy for a 'Long Time': Source "They think Luna will do a great job with the baby," a source tells PEOPLE exclusively about John Legend and Chrissy Teigen By Melody Chiu Melody Chiu Instagram Twitter Melody Chiu is a Senior Editor for PEOPLE. She has been with the brand since 2009, editing, writing and reporting across all entertainment verticals. She oversees PEOPLE's music and events coverage and has written cover stories on Taylor Swift, Selena Gomez, Melissa McCarthy, Blake Shelton and Sandra Oh. The Los Angeles native graduated from the University of Southern California and has appeared on Extra!, The Talk, Access Hollywood and Good Morning America. People Editorial Guidelines Published on November 21, 2017 08:00 PM Share Tweet Pin Email Trending Videos Chrissy Teigen announced in an adorable Instagram post Tuesday afternoon she and husband John Legend are expecting their second child, and sources tell PEOPLE the superstar couple have been hoping to expand their family for quite some time. “They have been planning for this for a long time. Chrissy is really excited to finally share the news,” an insider tells PEOPLE exclusively about the stars, who are parents to their 19-month-old daughter Luna. On Friday, Legend, 38, told PEOPLE he and Teigen, 31, have been “working on” baby No. 2. Opening up to InStyle about her journey to motherhood via in vitro fertilization, Teigen explained she and her Grammy-winning husband started with 20 embryos and narrowed the number down to three after screenings. “They are so excited to make Luna a big sister,” says another source. “They think Luna will do a great job with the baby and they’re really happy to be expanding their family.” Just as elated about the news is Teigen’s mom Vilailuck “Pepper” Teigen, who often shares sweet photos of her granddaughters (the cookbook author’s sister Tina also has a young daughter) on her Instagram. Adds the source: “Chrissy’s mother is thrilled to have another grandbaby on the way!” John Legend/Instagram Teigen and Legend celebrated their fourth wedding anniversary on Sept. 14 and brought baby Luna on tour with them for part of Legend’s Darkness and Light Tour. “I’m much luckier to have John’s personality in my life than he is to have mine,” Teigen previously said about Legend. “He is insanely patient and such a dork, and he loves seeing me happy.”