It looks like Leah is about to be a big sister! “Teen Mom” baby daddy Gary Shirley is reportedly expecting his second child with his on-again, off-again girlfriend Kristina Anderson!

A source close to Amber Portwood — the mother of his first child, 5-year-old Leah — reveals he told the once troubled star of his girlfriend’s pregnancy a few weeks back.

“Gary told Amber that Kristin is pregnant with his baby about a month ago,” the source says.

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This comes just days after Amber appeared on the MTV special “Ask the Moms” on Monday Oct. 6 and divulged that while she was behind bars, Gary led her to believe they were still together while secretly dating Kristina behind her back!

“Honestly, they deserve each other,” the reality starlet cryptically said on the special, which was taped in August. “You guys will see!”

READ MORE: Amber Portwood Says Gary Was Secretly Seeing Someone Else — While She Was Locked Up!

While neither Gary nor Kristina has confirmed the pregnancy, it’s possible she was referring to a baby bump, as he even hinted about a possible addition back in September.

“I don’t wanna sleep! Lol! (Gonna rub the bun in the oven} :),” he tweeted on Sept. 15. He added to the mystery by following it up with a tweet that said, “So my sister had twins a couple weeks ago and my bro just had a son today! Baby’s everywhere!”

And it sounds like there’s going to be another cousin joining them soon… Congrats to Gary and Kristina!

Radar Online first reported the pregnancy.