Stephane Cardinale/Corbis
May 11, 2015 03:45 PM

Her royal babies were picture perfect on their christening day Sunday, but no smile was brighter than that of their mom, Princess Charlene.

Months of planning coming off without a hitch, sources tell PEOPLE, left Her Serene Highness The Princess of Monaco – her official title, which was last held by her late mother-in-law, Grace Kelly – elated at the baptism of her five-month-old twins Gabriella and Jacques.

“No one has seen Princess Charlene that happy as she was yesterday,” a source who attended the christening tells PEOPLE. “By the time she got to the crowds in the palace square she was walking on water.”

Charlene’s personal touches were evident throughout the day’s ultra-glamorous events. Among the details she tended to: inspecting the floral arrangements that scented the air in Monaco’s cathedral, including 6,000 white roses mixed with sprays of white fuchsia, delphinium, peonies and muguet.

Lilies, signifying the 37-year-old princess’s South African nationality, were also featured in the bouquets. “She was determined that not only her family but all her friends from South Africa felt at home in Monaco,” says the source.

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The most obvious nod was naming two South Africans as Princess Gabriella’s godparents: Charlene’s younger brother Gareth Wittstock and her close friend Nerine Pienaar, wife of legendary South African rugby union player Francois Pienaar. (He was portrayed by Matt Damon in 2009’s Invictus). During an intimate afternoon lunch, which Charlene planned with Chef Christian Garcia, South African lobsters flown in from Cape Town were served to the 200 or so guests.

While the princess had spent months worrying the details of her children’s matching flowing christening downs (with Calais lace, plant-inspired embroidery and cotton bonnets), she also sported her own Dior Haute couture look: a short- sleeved top over a flared dress in pale green crepe silk, accessorized with a thin-ribboned Monaguesque decoration. She also wore a Dior mini chapeau known as a “bibi” and grey mesh gloves.

After the religious ceremony and the walk through the crowds of well wishers gathered in the palace square, Charlene’s hostessing drew praise from invitees.

“There was a garden party for 300, a medals and decorations ceremony and her smile never left,” says one attendee. “She was relaxed and over the moon.”

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