James took to Instagram to confirm the news.
The upcoming baby, whose sex has not been revealed, will join the couple's eldest child, daughter Vivianne Rose Decker, who was born on March 18, 2014.
The 26-year-old singer and reality TV star posted a family photo that showed her sporting a visible growing baby bump.
"Vivianne is so excited because she is going to be a big sister! We are over the moon about having another baby!!!" she captioned the shot.
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