Ecstatic Coleen, 22, is three months pregnant, according to close pals.
She and England ace Wayne, 23 - man of the match in Saturday's win over Slovakia - are said to be "absolutely thrilled".
The baby - due in September - will have a specially converted nursery in the couple's £3.5million Cheshire mansion, it's claimed.
Wayne and Coleen's official spokesman refused to comment - but a source close to the couple said of the news: "They don't know whether it's a boy or a girl yet ... they don't mind either way."
In January Coleen was pictured on holiday in the Caribbean in a bikini with a slight tummy bulge.
Pals have also revealed the mum-to-be has been "lying low" for the last few weeks, saying she has a cold.
She was spotted taking things easy this week - getting her mother and brother to push a heavily-laden trolley round a supermarket for her.
Industry insiders predicted last night that the first picture of the Rooney baby could fetch as much as £1million - a new UK record.
Wayne and Coleen's spokesman said: "These pregnancy rumours have been too numerous to comment on and we gave up doing so a long time ago."