Kelly, 48, invited good friend Andy, 50, to guest host the talk show in place of Ryan Seacrest for the day and they naturally started talking about the Bravo host's son, Benjamin, 10 weeks.
As fans know, Andy welcomed his first child on February 4 via surrogate.
“I was putting it out there for Mark last night,” she said. “He was like, ‘It’s all right. Let’s be grateful for what we have.'"
As OK! readers know, Kelly and Mark share three children together — Michael, 21, Lola, 17, and Joaquin 16.
What do you think of Kelly wanting a fourth child? Let us know in the comments below!