Horner was the focus of an investigation at Red Bull last month after allegations were made of inappropriate behaviour were made against him by a female employee.
He was cleared by the investigation earlier this week, but just 24 hours later screenshots of messages allegedly between Horner and the female employee were leaked by an anonymous person to media outlets and F1 bosses.
In the midst of all this, Geri took a flight to the Middle East to be by her husband's side.
The Spice Girl singer hasn't been seen in public since the allegations were made against Horner.
Geri Halliwell is set to appear on the grid in Bahrain
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But according to the Telegraph, Halliwell is continuing to stand by her husband and plans to show her solidarity during Saturday's season-opening race in Bahrain.
The report claims she is 'planning to be photographed' with Horner on the grid ahead of the race.
It's also claimed there are 'concerns in F1 circles' about the authenticity of the leaked messages.
Nobody has yet come forward and taken responsibility for the leak and Horner refused to give his view on the supposed messages when asked on Friday.
"I am not going to comment on anonymous speculation from unknown sources," Horner told Sky Germany.
"I followed in full the grievance process, which was completed in a thorough way.
"The result of which was the grievance was dismissed and as I said, I can't comment on unknown sources."
When asked what his next focus is, Horner replied: "We go racing.
"Max Verstappen has also faced questions about Horner's future at Red Bull this week and whether he's confident in the 50-year-old continuing his role.
Geri Halliwell has been a regular by her husband's side in the F1 paddock
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When directly asked whether he still had faith in Horner as his team principal, Verstappen replied: "Listen, when I look at how Christian operates within the team, he has been an incredible team boss.
"So absolutely, from the performance side of things, you can't even question that.
"So that's what I'm also dealing with.
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Christian Horner and Geri Halliwell have been together for 10 years
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"I speak to Christian a lot, and also throughout the weekend here. He's fully committed to the team.
"He's also here for the performance. Of course probably a little bit distracted.
"But like I said before, we just focus on the performance side of things and that's how we all work together."