Introducing: a new Princess SiSi!

On Thursday (February 15), while announcing the launch of their new app TraceMe, Ciara and her husband, Russell Wilson, shocked the world by sharing the very first photos of their newborn daughter, Sienna Princess Wilson, on Instagram.

“Today is just the beginning, I’m sharing something near and dear to my hear with you,” the “Body Party” chanteuse started the caption of an image showing her holding baby Sienna away from the camera, "…meet my baby girl on my @TraceMeApp."

The new app offers Ciara's fans a behind-the-scenes glimpse into her high life, from personal moments with friends and relatives to her work in the booth and behind the mic to (conceivably) more cute snapshots of the latest member of her growing family.

“She’s The Sweetest Angel! Read my letter to Sienna and see more photos of Baby Sisi and I Shot By Daddy on my TraceMe app," the dancer inscribed in tandem with a picture unveiling 9-month-old Sienna, nestled safely in her mother's arms.

"I'm so excited to be opening up my world to you on TraceMe. You guys know that I tend to be private with a lot of things, but with TraceMe I can have a genuine, unfiltered connection with you all,” the "Goodies" performer writes in a letter on the app. “My motivation for this was to give back for all of your support throughout the years. We now have a special place where you can get to know more about me, and see all the fun things that go on with my music, my family, my fashion, and so much more."

The 29-year-old football star and 32-year-old actress-musician wed in July 2016. Baby Sienna, born April 28, 2017, is the spouses' first child together, though the second for Ciara — she also has a 3-year-old son, Future Zahir Wilburn, born in May 2014, named after his father, rapper Future.

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