The thoughtful, heart-touching messages include romantic, funny, religious, and short and sweet options ... You Thought of Them 16. You make life so much sweeter than birthday cake.

Nadya's post read: "Happy Sweet 16th birthday to Noah ... [prayer hands emoji and red heart]." Many fans sent birthday wishes and expressed astonishment at how much Nadya's kids have grown.

The superstar captioned the reel,"happy Sweet 16 ... sharing messages of positivity and drawing comparisons to how much he looks like his stepdad. "Aweee happy birthday you'd think that was ...