The 37-year-old star - who shot to fame in the group in the 1990s - would love to have either a brother or a sister for her two sons, Beau, six, and two-year-old Tate, and admits she would love to see her little girl wearing some of her cute Baby Spice outfits.
Emma - who is engaged to Jade Jones - exclusively told BANG Showbiz: ''I would love another child, of course, I love babies. I'm not on track at all though at the moment. I don't know if it will happen or not, I really don't know.
''I wouldn't mind a son or a daughter, if I had another boy it would be amazing, or a girl, I really don't mind. I do have a lot of Spice Girls outfits I could hand down though if I had a daughter.
''I've also got a niece though so if it doesn't happen then they will still be going somewhere special.''
Emma would love Beau to follow in her footsteps and become a singer but she admits the youngster is too pre-occupied with sports to think about being a performer at the moment.
She added: ''Beau loves music, he really loves music and so does Tate. They are always singing along to songs, they love all that.
''Whether they go on to become singers, I'm not sure. At the moment Beau is doing tennis and go-karting and all sorts of things. If he did want to be a singer then I would support him in that and whatever he wanted to do.
''Tate is far too young to know just yet.''
The movie begins filming in the UK.
The 'Sherlock' and 'Doctor Strange' star joined Gilmour onstage at the Royal Albert Hall for a rendition of the Pink Floyd classic.