Chelsea Houska's 4th baby bump just got a massive shout-out on Instagram – and it's getting big. The "Teen Mom 2" star is currently expecting her third girl and fourth overall child with 2016-married husband Cole DeBoer. Chelsea, 29, announced she was pregnant earlier this summer, with the reality star dropping the odd baby bump update for her 5.8 million followers since. Chelsea posted to her stories on Friday to show off the progress. Check out the mom of three's stunning shot below.