ET caught up with the expectant parents at City Harvest's 35th Anniversary Gala at Cipriani 42nd Street in New York City on Tuesday, and they opened up about getting their nursery ready before their son arrives in June.
"Were kind of just using Luna's old things," joked Teigen. "It will be fine."
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Chrissy Teigen Gushes Daughter Luna Is 'So Excited' to Be a Big Sister (Exclusive)
As for Luna gearing up to be a big sister, the couple said she "still has zero clue" about what it means for them to be having another kid, because she's still essentially a baby herself.
"She knows just as much as she knew eight months ago, which is nothing," Teigen said. "So it's going to be a surprise."
"She knows to call it a 'baby,' but I don't know if she [can] clarify what that really means to her yet," Legend added.
The couple enjoyed a fun night out together at the anniversary gala for City Harvest -- a New York-based nonprofit organization dedicated to food rescue, distribution and education -- where Teigen was honored for being "the heart of the city."
"This is big for me because," Teigen explained. "Obviously, food is my complete heart and soul."