Heidi Klum insists she "never looked at another man" while she was with Seal.

The supermodel has spoken out for the first time since her estranged husband made shocking claims that she was unfaithful to him during their relationship at the end of last month.

The German star and musician Seal announced their separation in January after seven years of marriage and are currently going through the stages of divorce.

"When we were together, I never looked at another man," Heidi insisted in a TV interview with Katie Couric for new daytime show Katie. "It was a unique choice of words I'm used to it. Other people aren't."

Sources have explained how upset Heidi was with the remarks made by Seal, which referred to her rumoured romance with her bodyguard Martin Kristen. Seal claimed it was Heidi's infidelity that caused their surprise break-up.

"Klum was devastated after Seal made the mean-spirited comment she was fornicating with the help,'" a source told the New York Post.