"Finally! Having a squirmy, busy busy baby is tough. I have been waiting so long for him to give me kisses! 16 months, worth the wait," Teigen caption a video of the adorable moment.
In the clip, Miles, who is sat in his high-chair, leans over the attached tray to pucker up and kiss his mum on the lips.
Many of Teigen's A-list followers celebrated her moment, including Gwyneth Paltrow, Mindy Kaling, Ali Wong, and Molly Sims, who all posted heart emojis in the comments section.
The "Bring the Funny" judge also has a daughter Luna, three.