Speaking on her friend and fellow Spice Girl Emma Bunton's radio show on Heart FM, Posh Spice - who is mother to Brooklyn, 12, Romeo, eight, and Cruz, six - said being a parent is the 'hardest job in the world'.
She also admitted it has been difficult maintaining her fashion sense during her current pregnancy. Beckham, 36, said: 'Everyone thinks you just get a tummy but everything changes. Even your ankles start to look a bit pregnant.'
She also expressed her joy that her fourth child will be a girl.
She said: 'I was so surprised when I found out because I was really expecting another boy. I cannot wait for her to be born.'