The 37-year-old singer singer dressed his baby girl up in a onesie with the words "Happy 1st Mother's Day" and a giant red heart printed on it, which he shared with fans via Instagram on Sunday.
"To my wonderful wife, @chrissyteigen. Luna and I are so lucky to have you in our lives," he wrote. "If our daughter can be even half as awesome as you, I will be so happy and proud. Happy 1st Mother's Day!"
Teigen posted the pic to her Snapchat, adding two red heart emojis. She also shared some photos of their Mother's Day brunch, which consisted of slow scrambled eggs, chicken and waffles, and roasted bacon.
On Saturday night, she flaunted her slim figure in high-cut denim shorts, which she styled with a bodysuit, silky black jacket and strappy heels during a date night with Legend at Jones Hollywood restaurant in Los Angeles.
The 30-year-old model looked just as flawless earlier in the day, when she donned a white suit and glamorous makeup while they were backstage for what Legend described as "a very secret music video."
She and Legend attempted to use the app's face-swap feature again, hoping for a better outcome from the last time they tried. The result was, well, not so great.
Ever since the couple welcomed Luna into the world, they haven't been able to stop gushing over their little bundle of joy via social media. Last weekend, Teigen shared a pic from "bath time" with her baby girl to Instagram, captioning it, "Bath time is tooooo cute! My heart, it hurts."