The British singer - who is engaged to builder Sam Cooper - has revealed CHANEL designer Karl will create the gown for her special day.
She was spotted visiting the Chanel studios yesterday (07.03.11) and when asked what she was doing there, replied: "I'm here to see Karl for my wedding dress."
Lily has a history with the French brand, often seen wearing Chanel and even fronting a campaign for the Coco Cocoon bag - although she was eventually replaced by Vanessa Paradis.
Speaking about it at the time, 25-year-old Lily revealed she felt like a "dumpling" while she shot the campaign.
She said: "When Karl Lagerfeld called about the campaign, I didn't tell anyone because I was convinced they made some huge mistake and that it wouldn't happen.