Red Bull's Christian Horner Under Investigation For Alleged Inappropriate Behavior

Red Bull team principal Christian Horner is at the center of an investigation ... after a staffer within the Formula One organization accused the longtime boss of alleged inappropriate behavior.

The energy drink giant released a statement on Monday ... saying,  "After being made aware of certain recent allegations, the company launched an independent investigation."

Red Bull added the probe is being conducted by an outside party ... and it takes the situation "extremely seriously."

Horner -- who has been with the organization since it joined the grid in 2005 -- has denied the allegations ... although the nature of the claims was not revealed.

Horner is by far the most successful team principal in the sport today -- winning the constructors championship six times at the helm ... and overseeing six drivers championships, most recently with Max Verstappen.

Outside of F1, he's also famously married to Geri Halliwell ... AKA Ginger Spice.

It's unclear if this will have any effect on the upcoming F1 schedule ... as the first race of the season kicks off with the Bahrain Grand Prix in March.