Leaked sketches of Heidi Klum’s wardrobe for an upcoming couture event have sparked rumors that the German supermodel is expecting her fourth child.

“It looks like Heidi is four months pregnant,” an insider who saw the images tells In Touch Magazine.

“She (Klum) plans to announce her pregnancy when she wears the dress to the event,” another spy squeals.

Heidi, 35, and her husband crooner Seal have two children together – Henry, three, and Johan, two. Seal is the adoptive father of the Victoria’s Secret model’s five-year-old daughter, Leni.