Duchess Kate beams in nautical wear as she and Prince William share their excitement over the royal baby

By Zach Harper

The Duke and Duchess of Cambridge stepped out to launch the The King’s Cup Regatta in London on Tuesday (May 7), and couldn’t contain their excitement about being an aunt and uncle after the birth of Baby Sussex. Kate grinned in a navy blue and white striped shirt, while sporting LK Bennett trousers at the location of the Cutty Sark, one of just three remaining British schooners from the 1800s, to announce the sailing event.

Kate certainly dressed the part for the nautical-themed event! Photo: © Chris Jackson/Getty Images

William said the couple were “obviously thrilled, absolutely thrilled” at their nephew’s birth, and then said he and Kate were “obviously looking forward to seeing them in the next few days when things have quieted down.” William then got a bit cheeky, and joked, “I’m very pleased and glad to welcome my own brother into the sleep deprivation society that is parenting.”

MORE: “I’m so proud of my wife”: Prince Harry gushes over Meghan following royal baby’s birth

Indeed, Prince Harry was already quite sleep-deprived right after his son’s birth! On Monday, when the cameras had turned off after an impromptu press conference outside Windsor Castle, the prince revealed he had only had about two hours’ sleep! Baby Sussex was officially born at 5:26 a.m. BST on Monday, meaning mom Duchess Meghan was in labour in the wee hours of the morning.

William and Kate are parenting experts now, having had three of their own children since they were married in 2011. They likely will offer the Duke and Duchess of Sussex quite a lot of support as they navigate their new lives. William said he had “plenty of advice” to offer his brother and sister-in-law, and then continued: “I wish him all the best and I hope [in] the next few days they can settle down and enjoy having a newborn in their family and all the joys that come with that.”

Duchess Kate holds Prince Louis after his christening in 2018, while Prince William holds the hands of Prince George and Princess Charlotte. Photo: © Getty Images

Prince George, Princess Charlotte and Prince Louis must really be looking forward to meeting their new cousin, whose name has not yet been revealed. Kate and William are, too, the duchess said. “It’s such a special time. Obviously with Louis and Charlotte just having had their birthdays, it’s such a great time of year to have a baby. Spring is in the air,” she continued.

MORE: Five ways the Cambridge kids will be the best cousins to the royal baby

“As William said, we’re looking forward to meeting them and finding out what his name’s going to be, so it’s really exciting for both of them and we wish them all the best. These next few weeks are always a bit daunting the first time ‘round, so we wish them all the best.”

As for why Kate and William were out on Tuesday, the couple are set to compete against each other in The King’s Cup, which is a charity sailing race, in August. Both royals will take part in the competition, and eight boats representing each of the duke and duchess’s charities will take to the waves. Amusingly, the couple were also set to race against each other in sailing simulators on Tuesday! The last time they competed against each other was in New Zealand

Child Bereavement UK, Centrepoint, the London Air Ambulance Charity’s 30th Anniversary Campaign and Tusk, of which William is a patron, will have four of the boats. The other half of the vessels will represent Addiction on Addiction, Place2Be the Anna Freud National Centre for Children and Families and the Royal Foundation, four of Kate’s patronages.The winning team will be awarded the trophy,

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