"They've never had Christmas before," The Voice star, 44, noted of daughter Esti, 11 months, and son Wren, 6 months. "They won't really get it yet, but we're excited to have all of us together celebrating Christmas."
"We're not going to be working over the holidays," he added. "We're just going to relax and enjoy each other and I'm excited for that."
The EGOT winner, 44, previously revealed that adding two babies to the crew wasn't totally smooth sailing.
"I think one of the toughest parts was just having the older kids adjust to not being the baby anymore, especially Miles," he spilled. "Miles is used to being the baby for a while. So, he had to take some time to adjust, but I think he's doing really well with it now. It just took him a couple months to adjust to that."
"They're really taking to it well now," the crooner continued. "I think it's actually making them more mature and they're stepping up. They're becoming more independent now. It just took a little while, but now I feel like it's really been good for them. They're more independent, more self-driven and mature."
The star also insisted he and the model, 38, "love" having such busy lives.
- Chrissy Teigen Shares New Photos of Her 4 Adorable Kids, Reveals Daughter Esti's Teeth Are Coming In
- John Legend & Chrissy Teigen Were 'Worried' Miles & Luna Wouldn't Welcome New Baby Esti: 'They Seemed A Little Jealous'
- 'It Was Pretty Emotional': John Legend Explains Why He and Chrissy Teigen Wanted Their Kids at Their Vow Renewal
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"Honestly, it's been a lot more joy and energy in the house. It's fun seeing the little milestones that they reach together and separately since they're five months apart," he said. "Esti is already close to walking. Wren is still not crawling yet. Just seeing them growing up, it's exciting and fun. We haven't had babies for quite a while now. Being in that baby phase with them is reinvigorating and fun."
Earlier this month, Teigen acknowledged she and her hubby have nannies when a fan asked how she manages to balance it all.
"I have lots of help and I also do a lot!" the cookbook author admitted. "But also I CAN do a lot because of the help!"
Entertainment Tonight spoke to Legend about his first Christmas as a father-of-four.