Heidi Klum has reportedly insisted her relationship with her bodyguard was "strictly professional" while she was married.

The German supermodel and musician Seal announced they were separating at the beginning of the year and are in the process of divorcing.

She has now been linked to her minder Martin Kristen, who has worked with her for four years. Over the weekend, Seal alleged the romance started when he was still with Heidi. She has apparently rubbished the allegation.

"Heidi told one close friend... her relationship with the bodyguard was strictly professional' while she was with Seal," reports TMZ.

Although the 39-year-old is said to be "very close" to Martin, their relationship is still "undefined".

Seal made the bombshell allegation to TMZ, claiming Heidi's supposed infidelity was the cause of their separation.

"Whilst I didn't expect anything better from him [the bodyguard], I would of thought that Heidi would have shown a little more class and at least waited until we separated first before deciding to fornicate with the help, as it were," he said.

"I guess you all now have the answer you have been looking for for the last seven months."