A statement from the pair, released last night said: “In response to a number of recent inquiries, Jamie Cullum and Sophie Dahl are delighted to confirm that Sophie is four months pregnant.
“There will be no further comment at this time.”
Statuesque Dahl, who is the granddaughter of children’s author Roald Dahl, married jazz musician Cullum at the start of the year.
The couple celebrated their wedding at a luxurious country hotel in January after keeping the event secret from all but their closest friends and family.
Pint-sized Cullum, 31, and model-turned-author Dahl, 32, had a blessing at the Lime Wood Hotel, set in the New Forest National Park, followed by a sit-down meal in a marquee.
The wedding was thought to have had a “winter wonderland” theme, with the venue lit with hundreds of fairy lights.
Guests sat down to food prepared by a Michelin-starred chef in a Spiegeltent, a pavilion described as a “travelling dance hall”, before Cullum performed in the hotel.
Cullum’s spokeswoman, Kas Mercer earlier said the couple did not officially marry at the hotel as that took place earlier.
Dahl, was understood to have worn a Versace dress and was walked down the aisle by her actor father Julian Holloway.
The couple, who got engaged last year after meeting in 2007, were believed to have turned down a big money magazine deal for their wedding.