Ask, and you shall receive -- Catelynn Lowell and Tyler Baltierra of "Teen Mom" are expecting!

After Catelynn declared in April that she and Tyler were prepared to have a second child, she shared on Twitter today that she's having a baby. And, what's more, she's almost halfway through her pregnancy. "#it'sofficial #4months" Catelynn captioned the very nautical photo below.

In 2009, on "16 & Pregnant," Catelynn and Tyler made the very emotional choice to plot out an adoption plan for their first daughter Carly, but now, five years later, they insist they're ready to raise a child of their own. "Tyler and I own our own home, have two cars and actually have money to support a kid," Catelynn told InTouch in April.

What do you think of the couple's big news? Share your reaction in the comments below, and be sure to send your congratulations!