"It feels wonderful. This is the most joyous time of my life," the mom-to-be told People. "It feels great to finally be able to share it with the world."
This will be the first child for Castillo and her husband of five years, Shane Aaron -- and parenthood has already thrown the couple some surprises.
"Shane and I were actually surprised it was a girl!" Castillo shared with Soaps In Depth. "We were certain it was a boy. But we're both completely thrilled. I'm one of three girls and I have two nieces, no boys. So our families weren't surprised at all. Everyone is very excited." Certain her husband will be protective of his baby girl, Castillo adds with a laugh, "Shane is now in the market for a shotgun."
General Hospital fans learned that Castillo's on-screen alter ego is also pregnant, and the actress says it is "awesome that GH wrote in Sabrina's pregnancy."
Castillo, who joined GH in September 2012, is due May 24, 2014.
What do you think of GH's Sabrina ending up pregnant? Is Patrick really the father? How will that impact Patrick and Robin's reunion? Share your thoughts in the Comments section below this article or you can click here to send us feedback.