Heidfeld is dating Frentzen.
It's a sensational headline, and nonetheless true -- Sven Heidfeld, the brother of former F1 driver Nick, and Heinz-Harald Frentzen's sister Nicole-Nadine Frentzen, are an item.
"We have known each other from our childhood," 25-year-old Frentzen, whose 47-year-old brother won races for Williams and Jordan, is quoted by the Kolner Express tabloid.
"Sven was more like a big brother to me," she added, "but it sparked suddenly at one of my brother's races."
Sven Heidfeld, 35 and the younger brother of former BMW driver Nick, runs a racing school called Heidfeld Racing.
Heidfeld and Frentzen, both Germans, were F1 teammates at Sauber in 2003.