Total sparkling wine sales are ahead by 13% year on year, with the Italian fizz up by 56%.
Champagne sales are up 10% and English sparkling wine is making its presence felt in the supermarket's sales figures, too.
Wine buyer Dee Blackstock MW said: "Despite the credit crunch, British consumers still want to retain some sparkle in their lives and they are clearly entertaining at home or taking picnics with friends and family.
"The success story of the summer has been prosecco, often overlooked in the past. Maybe this has something to do with its attractive price tag, as well as the fact that Britons have grown to love it during holidays spent in Italy."