Ralph Lauren's daughter Dylan and her husband Paul Arrouet have welcomed fraternal twins. The 40-year-old's son Cooper Blue and daughter Kingsley Rainbow were born on Monday via a surrogate, with Dylan and her Paul, 44, confirming to People on Wednesday afternoon that they 'are celebrating the birth of their twins'. A spokesperson for the couple added to the outlet that 'her parents, fashion icons Ralph and Ricky Lauren, are overjoyed to welcome their first grandchildren and witness their daughter usher in the next generation'. Scroll down for video . Baby news: Dylan Lauren and her husband Paul Arrouet (pictured) welcomed fraternal twins into the world on Monday via a surrogate . Working mother: The new mom, who was photographed at a party thrown by the Hollywood Reporter earlier this month, named her son Cooper Blue and her daughter Kingsley Rainbow . Dylan, who is the founder and CEO of popular confectionery chain Dylan's Candy Bar, revealed in this week's issue of the magazine that she chose a surrogate because it's a 'wonderful option' and it was the way she and her husband always 'wanted to start a family'. During the interview, which took place shortly before the birth of their twins, Dylan noted that she had already come up with a few adorable nicknames picked out for her son and daughter. 'I’ve been calling them the Twinkies, the M&M’s and the Doublemint Twins,’ she said. 'Good things come in twos.' She also revealed that the twins’ nursery was decorated and ready for their arrival well in advance in case her babies were born before their due date - which they were. Family ties: Dylan posed with her older brother Andrew and their parents Ralph and Ricky Lauren in 2006 . Stylish siblings: Dylan and her brother David donned their dad's designs to a party in 2010 . Cooper and Kingsley's new room is covered in pastels, bunnies and complimentary blue and pink gingham, and it's not difficult to figure out where Dylan found her inspiration. 'My favorite holiday is Easter and my favorite animal is the rabbit,' she told Fox News earlier this month. Dylan married Paul, the co-founder of Marblegate Asset Management, in June 2011 at her family's Bedford Estate. The confectionery entrepreneur wore wore a handmade duchesse satin, silk tulle, georgette embroidered dress with a tiered train designed by her father. The 75-year-old designer admitted in an interview with Oprah that year that creating the gown was an emotional experience. 'I had to do something that was better than ever before. When you do something for your family or your daughter, I mean it's the only daughter I have - beautiful girl,' he said.
The 40-year-old's son Cooper Blue and daughter Kingsley Rainbow were born on Monday . Dylan and her husband Paul Arrouet married in 2011 .