Kailyn Lowry's Third Son Lux Russell Is Growing Up So Fast!

Where has the time gone?! Kailyn Lowry welcomed her third son, Lux Russell, in early August with her ex-boyfriend, Chris Lopez, and it seems that he is growing up too fast!

A mini Kail!

How is he so big already?!

Cuteness overload!

The MTV star also has two older sons from previous relationships. She has Isaac with her ex-boyfriend, Jo Rivera, and Lincoln with her ex-husband, Javi Marroquin.

Do you think Lux looks like Kail or Chris? Let us know your thoughts!