Camryn Manheim is such a proud parent and couldn't resist sharing a sweet tribute to her only child to mark his milestone birthday last week.MORE: Law & Order's Odelya Haveli stuns in beach photos ahead of her new major roleThe Law & Order star took to Instagram to post a collage of pictures side-by-side of son Milo, both as a little boy and in present day.In the caption, the actress gushed about Milo's kindness and incredible achievements.VIDEO: First trailer for Law & Order reboot sparks massive reactionShe wrote: "This beautiful boy turns 21 today. I am endlessly proud of you.