In a teaser for Monday's episode, Catelynn says to their 3-year-old daughter Novalee Reign, 'Come show Daddy your pretty shirt.' A t-shirt that reads I'm Going To Be A Big Sister can be seen.
'Stop,' Tyler responds while noticing the shirt.
'Yeah, she is!' Catelynn says, giggling, then the two share a kiss.
This news doesn't come as a surprise to fans, who have been speculating for some time that the pair were expecting.
The couple have been together for 12 years, celebrating their anniversary in July. Dating since middle school, the two 25-year-olds welcomed their first child, Carly, in the first season of MTV’s 16 and Pregnant.
They placed Carly for adoption and continued to document their lives together for MTV’s Teen Mom OG, welcoming Nova in 2015.
Congratulations to the growing family!