The 41-year-old and her family have remained on the extravagant yacht while fellow A-listers pack up and go back to Hollywood.
Gwen basked in the sunshine of Saint Jean Cap Ferrat on the deck of the boat, Luna, wearing a tiny polka dot bikini.
Athletic: Gwen Stefani shows off her trim figure on the deck of the Luna yacht in Saint Jean Cap Ferrat
The mother-of-two displayed an enviably toned and trim figure in the two-piece with sculpted abs and lean legs.
Gwen wrapped herself in a towel and helped her sons Kingston, five, and Zuma, two, as they played on the luxury vessel.
The family, including Gwen's husband Gavin Rossdale, have been enjoying all the spoils of the Mediterranean - sunbathing and hosting friends on the Luna, and jet-skiing in the blue water.
Hard work: Gwen recently revealed that her enviable figure is the result of gruelling workout sessions five days a week
Gwen has also been making appearances on the red carpet.
The No Doubt singer looked stunning in a black and white dress with dramatic make-up at the Cannes premiere of This Must Be The Place over the weekend.
She also attended a screening of Brad Pitt's The Tree Of Life, and glammed up for amfAR's Cinema Against AIDS 2011 event with husband Gavin.
Gwen recently revealed that sculpting her shape is ‘a daily struggle’ and has put her toned physique down to a gruelling fitness regime.
Playtime: Gwen helped her sons Kingston and Zuma as they played on the deck of their luxury boat
Speaking to the U.K version of Elle Magazine she: ‘I work out five days a week, I can’t imagine not doing it.’
The mother-of-two also admits she does sometimes find it a struggle and added: ‘I’d like to have no rules and eat what I want, but I’ve learned over the years that I’m so disappointed when I can’t wear the clothes I want to wear.’
‘And if I let myself down, appear on stage when I’m not looking my best, it’s not fun for me. I just beat myself up about it.’
Red carpet diva: The 41-year-old looked glamorous at the premiere of This Must Be The Place in Cannes over the weekend