She most definitely popped!

Pregnant Teen Mom 2 star Chelsea Houska’s baby bump stole the show while filming the reunion special with her costars this weekend.

MUST SEE: Chelsea Houska Makes a Big Announcement on Instagram — Get the Scoop!

In one pic, Chels posed with her costar, Kailyn Lowry, who playfully rubbed her belly.

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A post shared by Chelsea DeBoer (@chelseahouska) on

The new pics come shortly after it was announced that Chels and her husband, Cole DeBoer, are expecting a baby boy.

Scroll through to see more pics of Chelsea’s baby bump!