"Teen Mom 2" star Chelsea Houska surprised everyone with the news that she is expecting her second child. Chelsea, who has been one of the most low key stars of the MTV reality series, revealed earlier this summer that she and her fiance, Cole DeBoer are going to have their first child together.

While Chelsea is already the mother of an adorable daughter, Aubree Houska, her life is about to change. Chelsea and Cole are currently planning their wedding, and are preparing to tie the knot in October. The pair, who have been dating for nearly two years, are a fan favorite couple of the reality show.

Chelsea Houska's big baby news

After Chelsea Houska announced that she was pregnant with her second child, fans immediately wanted to know if that baby was a boy or a girl.

However, Chelsea didn't seem to know at the time, but she might know now. When asked by a fan on Twitter if her baby was male or female, the "Teen Mom 2" star replied using a zipper mouth and wink face emoji. 

Why is Houska keeping quiet?

In addition to the tweet, Chelsea also revealed via her social media page that every time she finds a cute baby outfit she wants to buy one in every size so that it will continue to fit her unborn child after its born. This definitely sounds like a mom who knows the sex of her baby. However, just after the pregnancy news was announced, one of Houska's supporters asked her if she would share the baby gender news once she found out. Chelsea replied that she probably would since she has a hard time keeping big secrets.

Gender reveal party in Chelsea and Cole's future? 

Perhaps the "Teen Mom" is waiting to reveal the gender of her baby until she's further along in her pregnancy.

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However, she may also be keeping it a secret so that she can do something special to announced the sex of the unborn baby, such as the ever popular gender reveal party, or a special gift for the baby's grandparents.

No matter if little Aubree gets a baby brother or a little sister, she's sure to be a great older sibling to Chelsea Houska and Cole DeBoer's baby, and "Teen Mom 2" fans can't wait to watch it all go down on TV.