The Wilson family is getting bigger -- Russell and Ciara just announced they have another baby on the way ... courtesy of a sexy silhouette video of the singer showing off her bump!!
The Denver Broncos quarterback and R&B star broke the news on Tuesday with footage Russ took during their anniversary trip in Japan a few weeks ago ... showing Ciara several months along in her pregnancy.
In the clip, Ciara danced to her new single with Chris Brown, "How We Roll" .