The star was asked by The View host Barbara Walters if she "anything to confirm", referring to the months of pregnancy rumours which have surrounded Ciara and her producer fiancé Future.
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Ciara said: "I would love to", before standing up and opening her top to reveal her blossoming tummy.
Jenny McCarthy, who also hosts the show, was the first to share her congratulations, posting a photo of the pair to her Twitter account after the show.
"Congrats to my girl @ciara so happy for your bun in the oven," wrote Jenny with the image.
Ciara got engaged to music producer Future – real name Nayvadius Cash – in October.
The rapper proposed on Ciara's 28 October birthday, presenting her with a huge diamond ring which has drawn comparisons with the sparkler with which Kris Humpries presented Kim Kardashian.
Ciara's eye-catching rock, which was designed by her fiancé, features emerald diamonds flanked by more diamonds around the side.
"The ring is a very intricate design which took longer to actually design than it did to produce," an insider told People.
"We went through several moulds and concept models before landing on the proper design, which allowed for maximum shine and stability in the diamonds. This vision of blending ring styles together allowed for a very unique ring."