“#CocoandEric,” Seymour, 43, Instagrammed the image of the sweet pair.
In April, Seymour posted a photo of the famous friends.
Last year, the Extra correspondent posted a photo of the pals enjoying lunch together.
Seymour and her beau, British model Clark Mallon, welcomed their daughter on March 9, 2015.
Cowell – who is Seymour’s ex-boyfriend – and his girlfriend Lauren Silverman welcomed Eric on Feb. 14, 2014.
Seymour has dished on Coco and Eric’s tight bond.
“Coco and Eric are like this,” she said while crossing her fingers.
She added: “They are really good friends and we go on lots of playdates. Eric calls Coco his girlfriend, so it’s scary. Simon’s already warned me, so we will see what happens there but Eric is adorable, such a cute little boy.”