Geri Horner remained tight-lipped as she was spotted leaving her London home on Monday, hours after Mel B claimed they once slept together.
Horner, a.k.a Ginger Spice, looked stern as she stepped out in a pale blue coat which she paired with an Alice in Wonderland themed Cath Kidson bag.
Brown made the shock confession – which reports claim Horner is set to deny – during an interview with Piers Morgan for his Life Stories series.
During the interview, Morgan had asked if there was any truth in the rumours that Brown and Horner had been involved in a tryst, urging her to be “brutally honest” in her answer.
Brown replied that they had “all slept in a bed together” but said that is was “not like that”.
She then smiled and nodded when Morgan asked if it was “like that” with Horner.
Brown replied: “She's going to hate me for this because she's all posh in her country house with her husband. But it’s the past.”
Discussing the candid clip on Good Morning Britain, Morgan revealed that Brown had rushed off set after the recording ended to phone Horner and “smooth things over”.
Their bandmate Melanie Chisholm looked aghast in the audience, with Morgan explaining that she was “running about” in shock after the show.
Since the claims, an old interview with Horner and Howard Stern on his self-titled show in the US resurfaced during which Horner admits to having “one lesbian sex experience”.
She told the host: “I don’t mind boobs but the other bit is not my cup of tea. I didn’t like the lesbian thing. It is part of experimenting. I was drunk at the time.”
The singer, who was known as Halliwell at the time of the Spice Girls fame, married F1 boss Christian Horner in 2015. The pair have two-year-old boy Montague together. She is also mother to Bluebell, 12, from a previous relationship.