Spice Girl Geri Halliwell’s F1 boss husband is being investigated over claims of “inappropriate behaviour” towards a female colleague.

Red Bull Racing chief Christian Horner, 50, is the focus of a probe being run by an independent lawyer appointed to examine her allegations.

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Horner, who runs the all-conquering team of world champion Max Verstappen, said: “I completely deny these claims.”

News of the allegations broke yesterday as the team boss was locked in preparations for Red Bull’s defence of their championship titles.

Given Horner’s high-ranking position, the female staffer is understood to have complained to the team’s parent company at Red Bull in Austria.

Staff at the team’s UK base in Milton Keynes claimed to have no knowledge of the allegations when approached yesterday.

Wife Geri, 51, was standing by him last night, telling pals she does not believe gossip that has been swirling for days.

A source close to the Ginger Spice star said: “Geri has been in floods of tears all weekend while looking after her kids.