The 39-year-old "Kandi Koated" singer said she was "thrilled" to share the news of her pregnancy, reported E! Online.
"We're so thrilled to announce the news of our bundle of joy, it's a dream come true," she said.
Kandi said the couple haven't learned the sex of the baby yet, but they've already started sharing the good news.
Tucker, who tied the knot with the singer in a televised ceremony in April 2014, said Kandi's daughter, Riley, and his daughter, Kaela, both from previous relationships, are equally excited.
The Grammy-winning singer-songwriter recently re-launched her record label, Kandi Koated, and has already signed two acts, the girl group Glamour and the band Loud.