Kailyn Lowry went public with baby No. 3's father this week.
"Ancestry DNA & yeah he is... stop with the headlines already," she tweeted in response to a headline reading, "Pregnant Kailyn Lowry takes DNA test -- Is Chris Lopez REALLY the baby daddy?"
Sources told E! News Lowry and Lopez are "just friends" and not together as a couple. Lowry said in a since-deleted blog post in April that she will be raising the child alone.
"I think I'm most worried about the changes ahead but also that I will have this baby 24/7 by myself with no help. I'm going to be a single parent from the beginning!" she wrote.
Lowry already shares 7-year-old son Isaac with ex-boyfriend Jo Rivera and 3-year-old son Lincoln with ex-husband Javi Marroquin.
She announced on her website Feb. 24 that she's expecting another baby in the summer.
"Please know this was a choice I made, I already know some won't agree but I've been showered with support by the ones I love since I found out," the star said.
"Of course, I was filmed on the show saying I didn't want any more kids but I'm pregnant again," she acknowledged.
"When I started thinking long and hard, and I knew I wanted more. This was the choice I made."
Lowry came to fame on the MTV series 16 & Pregnant before starring on Teen Mom 2. The show co-stars Jenelle Evans, Leah Messer and Chelsea Houska, and completed a seventh season in March.