The 35-year-old, who announced this week she is expecting her third child, thanked the rest of her former bandmates for their kind messages of support but failed to mention Posh Spice.
Mel B wrote: 'Ahh big thanks to my spice girls mel c, geri and emma for all the baby well wishes! Love you! Xxxx.'
She later added: 'I love and support all my spice girls always have!!!'
The tweet suggests Victoria, who is also pregnant, has not been in touch with her pal to congratulate her on her first child with husband Stephen Belafonte.
Emma Bunton, who is expecting a baby boy later this year, had tweeted: 'We've spoken privately but congratulations again!'
Mel C added: 'More babies!! Love and congratulations to Mel B and (husband) Stephen (Belafonte)', while Geri Halliwell has also sent her best wishes.