Victoria Beckham thinks it will be "quite sad" if Geri Horner, Emma Bunton and Mel B perform Spice Girls songs together.
The trio formed the group GEM together after Victoria and Mel C refused to take part in a Spice Girls reunion and Victoria thinks they should sing original material rather than classic Spice hits.
When asked if she wishes them luck, Victoria told the Sunday Times Magazine: "Of course, as a new group, I do. I do think they should sing new material, though, because what we did as the Spice Girls was so special. If they sang Spice Girls songs, I think I might be a bit sad."
Fashion designer Victoria also revealed she often feels "guilt" at being a working mother and has ruled out adding to her brood with husband David Beckham.
The star - who has children Brooklyn, 17, Romeo, 13, Cruz 11 and four-year-old daughter Harper with the retired soccer player - said: "I am done [with having children]."
"People have been obsessed with it -she's getting divorced, she's pregnant, she's getting divorced, she's pregnant - ever since I met David."
"I think that the kids get harder as they get older. The most important thing is to make sure that each child gets the individual attention that they need. But I can never go to bed early because Brooklyn is always up and that's when I get to see him, and then you've got Harper who is up super early. So I do feel that I'm being pulled in four different directions with the children. And then I have David and work, too.
"The truth is, it is hard. You feel guilty if you're missing something with the children. If I'm away on holiday or away for the weekend, I hide in the loo or a cupboard because someone at work is emailing me and they need answers to something, and I feel I have to hide those things because I don't want to impinge on the family."
And Victoria admitted she and David are extremely strict parents.
She said: "We're very strict with them. We've always had great relationships with them, as have both mine and David's families. Please and thank-yous have always been a priority, and they don't consider themselves entitled at all."
"So yes, we are strict. We've never spoilt the children with anything other than love. We're a very affectionate family, we're always cuddling and we communicate constantly, and we're very present with the kids. We've never missed a parents' evening or a sports day or any of the things you have to go to. They are our priority."