Stefani, 42, who got married to Rossdale, 46, in 2002 in London, is also telling friends that she is considering adopting to add to their own brood of two children, reported Femalefirst.
"Gwen and Gavin are going to remarry on September 14. They feel like they've fallen in love all over again. They'd also love another baby, but Gwen thinks because of her age adoption is the way forward," a source said.
The 'Hollaback Girl' hitmaker is a proud mother of two sons - Kingston James McGregor, 6, and Zuma Nesta Rock, 4.