The "Shake It Off" singer revealed her happy news on Sunday, March 1, when she shared an adorable picture via Instagram of her holding pal King's growing baby bump in her hands and looking at it intently.
"Guess who just got named Godmother of this little one….." she captioned the picture, adding in a "ME" in brackets, in case anyone had any trouble figuring it out.
King, 35, who announced her baby news last month, shared another photo of her and Swift looking down at her belly from above with an equally sweet caption.
"And @taylorswift will forever be looking over our new baby @kyle_newman -we all love you!!!! Xx," the excited mom-to-be wrote.
The Hart of Dixie actress and her husband Kyle Newman already have one son, James Knight, 16 months, who was conceived after an eight-year struggle with fertility problems, including five miscarriages and five rounds of IVF.
The arduous journey, however, was worth it for the star who told Us Weekly last September that there was nothing more rewarding than being a mom. "It's the best thing in the whole world," she gushed to Us.
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