'Can’t wait to meet you': 'Teen Mom OG' star Catelynn Lowell shares sonogram of baby number three

'Teen Mom OG' star Catelynn Lowell says she and her husband Tyler Baltierra were not planning on having another baby but were pleasantly surprised by the news

'Teen Mom OG' star Catelynn Lowell, who is expecting her third child with husband Tyler Baltierra, shared a picture of the baby's sonogram with her fans via an Instagram post over the weekend. “Already can’t wait to meet you little nugget,” Catelynn, 26, captioned the ultrasound. At the end of the caption, she added three emojis, a heart, a rainbow, and a heart-eyed smiley face.

This adorable revelation from the reality star comes weeks after she shared her pregnancy news during an interview with Us Weekly. Catelynn revealed to the outlet that the pregnancy came as a surprise to the happy couple themselves. “The big news is that we are expecting our rainbow baby. This baby is our rainbow after the storm. I’m super excited,” she said.

“It was a huge shock at first. We were not planning it, especially after the miscarriage and how I went downhill with my mental illness,” she continued. “We were going to wait a really long time. We were using protection and everything and still got pregnant,” she added. “This baby just wanted to be here. It was very unexpected.”

In a video from the  MTV series’ upcoming seventh season, the fans got to witness a sweet mother-daughter moment when Catelynn told her daughter Novalee Reign that she was going to be a big sister. “You know why we’re making pink and blue cupcakes?” she can be seen asking her daughter in the clip as they prepared for the sex reveal party. “Why are we having a party tomorrow? You know why? Mommy has a baby in her belly.”

Though the little Nova made it clear that she preferred to have a baby sister, she still went on to list everything she would love to do with her sibling. “I can rock it, and feed it bubbles,” she sweetly said. “I can be [a] big sister.” 

The couple has been together for 13 years and they celebrated their anniversary in July. They were dating since middle school, when they had their first child Carly, in the first season of MTV’s '16 and Pregnant'. They placed Carly up for adoption and continued to document their lives for  MTV’s 'Teen Mom OG', welcoming Nova in 2015. Catelynn and Tyler, also 26, got married at Castle Farms in Charlevoix, Michigan, eight months after Nova's birth.