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Seal confirmed his wife Heidi Klum is expecting at a New York City concert.

"[The] topic of debate outside our hotel is, 'Is Heidi having another baby?'" he told the audience. "Heidi and I are having another baby!"

"I mean, Heidi is doing all the work," continued the Grammy-winning artist before breaking into his song "A Change Is Gonna Come."

Klum cheered on her husband from the sixth row of the Radio City Music Hall show. She was joined by her kids, Leni (with Italian businessman Flavio Briatore), Henry Gunter, 3, and Johan Riley, 2.

Earlier today, a source told Us Klum was expecting her fourth child.

"They have a great and very happy family," the source adds. "They definitely have always wanted a great big family."

The Project Runway host calls motherhood "the most amazing thing. For me, now I'm second. Before, I was always first."

Seal and Klum got engaged on Christmas Eve 2004. They tied the knot five months later on May 10, 2005 on a beach in Mexico.