She also posed with her boys on the beach, writing, “Coki beach & the people are so good to us! Needless to say, the kids are so happy & tired out.”
Lowry later shared an underwater shot of little Isaac, writing, “My baby learning to snorkel,” as well as a pic of her sons with their arms around one another, with the caption, “Had so much fun today!”
Lowry shares Isaac with her ex, Jo Rivera, and Lincoln with ex-husband Javi Marroquin. She has kept the paternity of her third child more of a secret, though fans have speculated the father is a friend of hers.
"I am pregnant," Lowry wrote, revealing the she was "sad" that the news had leaked prior to her official announcement. "I'm sad that I should have known that people in my life would sell me out before I was ready. Like any normal person, I want it to be a happy time. I wanted this to be a private time so I could be excited while not getting chased by paparazzi and bothered with crazy headlines."
For more from the Teen Mom stars, watch the clip below!