AceShowbiz -

Jessa Duggar took to Instagram on Monday, May 18 to show off her growing baby bump for the first time. The proud soon-to-be-mother simply wrote, "16 weeks 1 day," alongside a snap featuring her caressing the little bun in the oven.

The selfie was taken sideways as Jessa posed in front of a bedroom mirror. In the snap, the "19 Kids and Counting" star was seen wearing her wavy blonde locks down while sporting a tight purple T-shirt and jeans.

16 weeks 1 day #BabyBump #BabySeewald

Foto kiriman Jessa Seewald (@jessaseewald) pada Mei 18, 2015 pada 10:43 PDT

Earlier this month, Jessa shared an update on Instagram to mark her 100 days of pregnancy. "#100 days pregnant! So amazing to read about #BabySeewald's development each week!" so she wrote. "If you could peek inside yourself now, you'd see a baby the size of your clenched fist."

#100 days pregnant! So amazing to read about #BabySeewald's development each week! ���¯���¿���½uc0uc0���¯���¿���½uc0@ben_seewald Week 14 Of Pregnancy "If you could peek inside yourself now, you'd see a baby the size of your clenched fist (and come to think of it, at 14 weeks of fetal development, your little one can clench his or her own fist!). As fetal development continues, your baby also has the coordination, strength, and smarts to wiggle his or her fingers and toes and even suck a thumb (how cute is that?)."

Foto kiriman Jessa Seewald (@jessaseewald) pada Mei 5, 2015 pada 8:04 PDT

Jessa and her husband Ben Seewald announced that they were expecting their first baby last month via Twitter. "Ben and I are so excited to announce that we're expecting a baby!!!!!" she shared with fans while revealing that the baby would come on November 1.

Later, the couple hinted at twins in a pregnancy update video. "Can't wait to find out if it's a boy or a girl," Ben said in the video, before teasing, "It could be both, who knows?"