Sarah Roberts from Season 4 of MTV's "16 & Pregnant" revealed that she had a second baby and hid her pregnancy from cameras while filming a reunion episode, The Ashley's Reality Roundup reports.

Roberts appeared on season 4 of the reality show but allowed cameras back into her life to film an update for "16 & Pregnant Season 4: Where Are They Now?" but hid one big surprise  - that she was six months pregnant with her second child. The special aired this summer but producers had no idea that in a couple months Roberts would be having a baby.

The 19-year-old reality star and her current boyfriend Justin welcomed Tessly on Oct. 1, 2013. According to Wetpaint, she gave birth via VBAC (Vaginal Birth After C-Section), which means she gave birth vaginally the second time but had a C-section for the first delivery. She described her little bundle of joy as "pure perfection" but told The Ashley's that she hid the pregnancy from MTV producers because she didn't want to be judged.

"I didn't want negative comments about an innocent child," she said. "She didn't deserve that."

Roberts revealed that she initially considered giving her newborn up for adoption but "couldn't follow through with it." She is already the mother to 2-year-old Tinleigh, with ex-boyfriend Blake Thomas. On season 4 of the show viewers watched as her struggles with motherhood and relationship issues with Thomas played out on TV.

In one episode, a few weeks after Tinleigh was born Thomas left to go work on a shrimp boat. Not long after Roberts shared her exciting baby news, the young mom was on Twitter defending her secret pregnancy.

"I also don't owe ANYONE an explanation about my children... So if you don't LIKE that I have another child DON'T LOOK. It isn't difficult," she tweeted.

"People do realize that until they start paying for MY children their opinion is irrelevant... Right?" she posted.

She also lashed out at fans who criticized her boyfriend who - judging by the picture - looks a lot older than her. Roberts did not reveal exactly how old Justin is.  

"You don't even know how old he is," she commented to a Twitter user who said she couldn't "lay down with someone that #Old."