The 'DWTS' pro admired the adorable mother-son moment on Instagram.
Maksim Chmerkovskiy knows what love looks like.
"....and nothing else matteredm" the 37-year-old dancer wrote. "#GoodNight #MyHeartBeat."
And the mother-son bond between Peta and her baby is already showing! Watch the video below for what Peta told ET about her son recognizing her face on TV during DWTS.