The 35-year-old made the announcement via her official website, adding a picture of a fourth pair of family shoes dated 2014.
The couple, who married four years ago at a glitzy, also have a 2-year-old daughter called Amelie.
In a joint statement, Rachel and 36-year-old Alex said:
‘We’re so happy to find out that we are pregnant again and can’t wait to meet our new little member of the family early next year. Needless to say, we’re all super excited, especially Amelie who is looking forward to meeting her younger brother or sister.’
The former S Club 7 star also shared the exciting news with her Twitter followers yesterday, writing:
‘Some lovely news to share with you all today - Alex and I are very happy to announce that we are pregnant again.’
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During her last pregnancy, Rachel admitted feeling sexier, revealing:
‘Yes I do [feel sexier]!
‘My body's going through lots of changes and I love having a bump.’
Husband Alex added: ‘I love curves and I think she looks fantastic especially knowing that she's carrying my baby.’