Kailyn Lowry flaunted her baby bump Monday night on "Teen Mom 2's" aftershow. The 24-year-old reality star showed off her growing belly next to co-star Leah Messer after announcing she's pregnant and expecting her third child. "Catch us LIVE tonight after the all new episode of #teenmom2 tonight @leahdawn92mtv," she captioned a photo on Instagram of herself with Messer. Lowry later denied her unborn baby's father is named Larry, tweeting, "Omg you guys Larry is a producer." The "Teen Mom 2" star had mentioned a "Larry" on the aftershow while discussing sons Isaac and Lincoln's reactions to her pregnancy. "[They're] excited," the star said of her kids. "But they keep fighting over whether it's a girl or a boy." "Isaac is a pretty damn good kid. Larry and I talked about him babysitting -- Isaac babysitting, I mean," she added before qualifying, "Just kidding!" Lowry had confirmed in a blog post Feb. 24 that she's expecting another baby in the summer. She shares 7-year-old Isaac with ex-boyfriend Jo Rivera and 3-year-old Lincoln with ex-husband Javi Marroquin, but has yet to announce the new baby's father. "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 wrote at the time. "Of course, I was filmed on the show saying I didn't want any more kids but I'm pregnant again," she said. "When I started thinking long and hard, I knew I wanted more. This was the choice I made." Lowry came to fame on the MTV series "16 and Pregnant" before starring on "Teen Mom 2." The series co-stars Messer, Jenelle Evans and Chelsea Houska, and airs Mondays at 9 p.m. ET.