Heidi Klum expecting fourth child

Supermodel Heidi Klum and her husband Seal are expecting another child together.

The popstar confirmed Klum's fourth pregnancy at a concert in New York yesterday.

"[The] topic of debate outside our hotel is, 'Is Heidi having another baby?'" said the singer.

"Heidi and I are having another baby!" Seal then performed his track 'A Change Is Gonna Come'.

According to Us Weekly, Klum was in the audience at the Radio City Music Hall with her children Leni, Henry Gunter and Johan Riley.

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

Seal and Klum wed in May 2005 in Mexico.