"Luisana's jaw-dropping beauty and effortless charm make her the perfect fit for Ultimo and working with her has been an absolute pleasure from the beginning," Ultimo founder Michelle Mone exclusively told HELLO! Online.
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"She takes everything in her stride and brought a unique sense of professionalism and glamour to our AW13 shoot. I couldn’t be happier with the end results – both Luisana and the new collection look amazing."
Argentinean-born Luisana models a range of stand-out lingerie pieces, including a leopard print set and sumptuous satin two-pieces.
Just last month, Luisana gave birth to her and Michael's first child, son Noah.
The Canadian singer, 37, wasted no time in sharing the happy news with his fans, posting a picture on Instagram taken in the hospital.
"Overjoyed and filled with gratitude at the arrival of our son Noah Buble. Born this morning, August 27th at 2.26 am," he wrote next to the adorable photograph, which shows his smiling wife cradling their tiny newborn as he proudly looks on.
Luisana gave birth in Vancouver, Canada.
Messages of congratulations quickly poured in for the couple, who married in several emotional ceremonies in their two countries.
Among the first was One Direction star Niall Horan, who was quick to join well wishers around the world, tweeting, "Congrats to my good friends @michaelbuble @lulopilato on the birth of little baby Buble! Soo exciting! Can't wait to meet the little one."
New mum Luisana, 26, first revealed that she was expecting back in January via her website, telling fans, "Mike and I have some big news for you." Her message was linked to the first scan of the baby.
His plan for fatherhood, Michaelsays, is "to try to be a good dad like my dad was and like his dad was. If he turns out to be a great, macho hockey player or a gay ballet dancer, I'll be just as happy as long as my kid is happy."