Look how big Mabel is now! And how adorably wee is baby Evelyn?!
"The start of a beautiful friendship #MabelRay#EvelynPenn," Heming tagged the pic.
She and Willis have been quite snap-happy lately, the model having just posted a pic over the weekend of herself breastfeeding her 3-week-old daughter, taken by her movie-star hubby.
Evelyn actually arrived a week late, a fact also noted by Heming on Instagram via a squeal-worthy pic of Willis' big man-hand holding his then-week-old daughter's teeny digits, all of which fit under his thumb.
"A week late and a week old today :)#EveylnPenn," Heming wrote on May 12.
She and Willis, who is a father of five daughters including his three girls with ex-wife Demi Moore, celebrated their fifth wedding anniversary on March 21.