There's a reason why Prince William and Kate Middleton avoid PDAs - or public displays of affection - during public engagements.
Fresh from their seven-day tour of India and Bhutan, the Duke and Duchess of Cambridge may have let their hair down a bit placing their arms around one another and during a trek up to Tiger's Next and trying their hand at archery in Thimphu - but royal decorum states they should avoid hand holding in public.
In 2014, during their royal tour of Australia, the couple posed so far apart that William was seen asking his wife, "So, what shall we talk about?"
Royal etiquette pro Myka Meier told PEOPLE the reason to avoid public displays of affection is simply their need to act professional.
"There is no actual etiquette or royal protocol that says the couple must refrain from PDA," she explained to the mag.
"The likely reasoning is more that while traveling on a tour such as the India trip, technically the couple are working representatives of British Monarchy. The couple are likely to show very little PDA, if any, to remain professional during their designated roles abroad."
The royal couple returned to London on Saturday and will host US President Barack Obama and First Lady Michelle at Kensington Palace on Friday night. Prince Harry will also be joining them.
The Obamas will dine with Queen Elizabeth at Windsor Castle for lunch earlier in the day, the day after her 90th birthday celebrations.
Meanwhile, Kate's extensive wardrobe for her latest tour, costing an estimate $40,000 is still hitting headlines around the world as fashionistas clamour to get any of her sell-out styles.