Jamie Oliver welcomes Crown Princess Victoria and Prince Daniel of Sweden to his new restaurant

Jamie Oliver's Fifteen restaurant in London was host to a trio of very exciting diners this week as the restaurateur welcomed Crown Princess Victoria, Prince Daniel and five-month-old son Prince Oscar of Sweden. Proudly sharing a photo with the royal couple on Instagram on Tuesday (Aug. 30), the celebrity chef wrote: "What a pleasure to have Princess Victoria of Sweden visit @jamiesfifteen today with Prince Daniel and their beautiful newborn baby Oscar.

"My amazing head chef Robbin is Swedish so it was really special. We had some really interesting conversations and sharing our passions around improving Child health for the next generation. Big love Jamie xx."

TAP TO VIEW GALLERYJamie Oliver in front of his restaurant with Princess Victoria and Prince Daniel Jamie Oliver welcomed Crown Princess Victoria and Prince Daniel to his London restaurant

No doubt one of those conversations was about their own young families; Jamie only recently returned to work following the birth of his son River Rocket, his fifth child with wife Jools Oliver, on 8 August. Victoria and Daniel, meanwhile, are parents to two children, baby Oscar, who was born in March, and his big sister, four-year-old Princess Estelle.

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It's been a busy week for Jamie. Over the August bank holiday weekend he teamed up with Alex James to host The Big Feastival, an annual food and music festival held in the Cotswold's on the Blur musician's farm.

The hugely-popular family event was celebrating its fifth anniversary, and played host to more than 55,000 people, including a number of famous faces.

Jamie Oliver with Alex James Jamie and Alex James hosted the fifth annual Big Feastival at the weekend

Zara Phillips was spotted at the festival, along with Mike Tindall and their daughter Mia, as was Amanda Holden and her fellow Britain's Got Talent judge Alesha Dixon. Fearne Cotton attended with her husband Jesse Wood and their two children, Rex and Honey Krissy, and singer Ella Henderson and Great British Bake Off winner Nadiya Hussain were also seen enjoying the outdoor event.

"Each year the festival gets better and better, and ourfifth birthday celebrations were no exception," said host Alex. "From headlinersMark Ronson and Tinie Tempah all the way through to big name foodies such asRaymond Blanc, this year's all-star line-up more than lived up to itsreputation as a fantastic melting pot of food, music and fun!"

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