Leeds-born Mel B 'upset' Victoria Beckham did not turn up for the final Spice Girls shows last week
The Leeds-born singer concluded the Spice Girls reunion tour with three concerts at London's Wembley Stadium from Thursday to Saturday.
However, Victoria Beckham did not attend.
Mel B said she expected Victoria to "come and just say 'Hi' at least".
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Hide AdAsked why Beckham had not attended a show on ITV's Good Morning Britain, Brown said: "Do I look like I know? I don't know - I'm sure she has her reasons for not.
"I've already said I was upset - I still am a little bit.
"But it is what it is, and us girls we all support each other no matter what."
GMB hosts Susanna Reid and Piers Morgan said Beckham had attended the wedding of Real Madrid footballer Sergio Ramos over the weekend in Spain, to which Brown replied: "It doesn't matter what it is."
She said there is no rift between them, adding: "We're all adults, we have to respectfully get on with whatever, but it is a bit disappointing, let's put it that way."
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Hide AdBrown, who earlier this year told Morgan on his Life Stories programme that she had once had a one-night stand with Horner, causing a reported rift between them, said: "I'm not a liar. I'm very honest. We're friends at the end of the day.
"Listen, she's (Horner's) used to dealing with me. So I'm going to say whatever I'm going to say within reason, respectfully, and I'm going to tell the truth, she just has to swallow that pill.
"I'm not apologising."
Brown also said she is keen for the Spice Girls to work on new music together, as well as taking their reunion tour across the world to Australia, America and Asia.
On the possibility of new music, she said: "That's a discussion that we haven't had properly, the four of us, but I think we should.
"I would love more Spice Girls music, but the thing is I wonder if we've still got it if we get in the studio, we might not have it.
"It was 20 years ago we wrote those songs."