Credit: Frank Micelotta/Getty Images

Seal doesn't even use it, but that hasn't stopped Heidi Klum from taking her singer husband's last name.

See photos of Heidi, Seal and other star soulmates

The supermodel and Project Runway host, 36, filed a petition Monday in L.A. to change her surname to "Samuel."

See more photos of today's top celeb news stories

Her decision to take Seal's last name (his full name is Seal Henry Olusegun Olumide Adeola Samuel) comes four years after they wed.

Klum is due this month with her fourth child, a daughter. She and Seal have two sons, Henry, 3, and Johan, 2, and Seal, 46, is the adoptive father of Klum's daughter Leni, 5.