Martin Grimes, FilmMagic

When Lily Allen announced plans to tie the knot with beau Sam Cooper, many speculated that the British songstress would walk down the aisle in a Karl Lagerfeld creation (Allen did, after all, serve as the face of Chanel's Coco Cocoon handbag collection).

But Lily's nuptials this weekend brought multiple surprises. In addition to announcing that she's pregnant, she wore a dress by an unexpected name: French talent Delphine Manivet.

Manivet, a Paris-based designer who describes her customer as "an urban woman who loves fashion, cries while watching James Ivory movies and laughs hysterically while watching "Sex and the City," said she was surprised when Allen visited her London store in January and requested the dress. Upon their first meeting, Manivet observed "She was like all my brides -- very cute and very sincere."

Allen eschewed her typically cheeky style for a traditional gown rendered in Calais lace and silk tulle. "She trusted me a lot," says Manivet. "She had an idea that she wanted something like vintage. But I think she was happy because I love the vintage but I do it more modern." Manivet said that she met with the Lucy in Disguise designer six times for fittings -- three in London and three in Paris. "For me it's very important that brides really feel the fabrics and it's like a second skin; I wanted her to touch the fabrics and the lace," she says.

To accommodate Allen's baby bump, Manivet created an under-dress for easy last-minute adjustments. "We used to do a lot of pregnant girls and are used to this kind of dress -- it's not a big problem," she says. "It has to be very comfortable for this day. We did an empire line. I used only natural fabrics like silk and cotton, and the lining was in cotton, which was very soft. When you're pregnant, your skin is more sensitive."

Manivet says Allen was far from a Bridezilla. "I think for her it was important to keep these moments very intimate. The first time she came with a lot of girlfriends, and then for the fittings she came alone," she reveals. "I think with her life -- with all the paparazzi -- it was a calm moment. But she was like all my brides -- so lovely and adorable with all the team. She wasn't a star at all."

Visit Manivet's website for a complete listing of where to buy her designs.

Courtesy of Delphine Manivet