Chrissy Teigen, a former model and food author, now juggles being a mother of four. She and her husband, John Legend, added two additional children to their family after raising Luna and Miles before.

In January, Teigen gave birth to her daughter Esti. Then, through a surrogate, the couple welcomed son Wren in June. Teigen recently discussed her surrogacy experience with PEOPLE, revealing why she wants to keep in touch with her surrogate, Alexandra, for the rest of her life.

She said, “I told her at the beginning of this journey, I wanted someone who would be there for birthday parties and throughout life.” She continued, “I wanted to meet her children, and I wanted my children to be friends with her children. And they really genuinely are, which has been a really beautiful thing to see.”

She added, “I wanted her to feel like she could take off her shoes and kick up her feet on our couch. We could watch TV together, and my daughter could play with her daughter up in her room. It felt like she could come over anything, and I really feel like we do still have that relationship. It’s been really wonderful.”