The singer's husband and manager, Rene Angelil, announced the baby news to People on Sunday.
"We're ecstatic," he told the mag. "Celine is just hoping for a healthy pregnancy. She was hoping for one baby and the news that we are having two is a double blessing."
The 42-year-old mom-to-be is 14 weeks along.
Celine welcomed son Rene-Charles in 2001, and has made no secret of her quest to expand her family since.
In February, the Canadian star told Access that she had passed on performing at the Winter Olympics in Vancouver to focus on becoming pregnant.
"I'm going through some in vitro treatments – so that was my choice," Celine said at the time. "I'm trying to [grow] my family, be with my son and maybe be a mom for a second child, hopefully. That would be my biggest dream right now."
And last December, the star opened up to Access about her struggles to conceive.
"We were [pregnant]," she said of August 2009 reports that she was expecting once again. "About 4, 5 days after, they found out that… it was not staying."
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