Royal couple tour India and Bhutan

The Duke and Duchess of Cambridge walk up a trail leading to the Tiger’s Nest Monastery during a visit to Bhutan on April 15, 2016.

Prince William, Duke of Cambridge, attends a reception celebrating UK and Bhutanese cooperation at the Taj Hotel on April 15, 2016 in Thimphu, Bhutan.

Catherine, Duchess of Cambridge, attends a reception celebrating UK and Bhutanese cooperation at the Taj Hotel on April 15, 2016 in Thimphu, Bhutan.

Prince William, Duke of Cambridge, looks on as Catherine, Duchess of Cambridge, fires an arrow during a Bhutanese archery demonstration on the first day of a two-day visit to Bhutan on April 14, 2016.

Catherine, Duchess of Cambridge, walks with HM Jetsun Pema Wangchuck in front of monks in Paro, Bhutan on April 14, 2016.

The Duke and Duchess of Cambridge arrive at Paro International Airport for a two-day visit to Bhutan on April 14, 2016.

The Duke and Duchess of Cambridge visit the Kaziranga National Park in Pan Bari Village, Kaziranga, India, on April 13, 2016.

Britain’s Prince William, and his wife Kate, the Duchess of Cambridge, cut a cake to celebrate Queen Elizabeth’s 90th birthday, which is April 21 at the residence of British High Commissioner in New Delhi, India, Monday, April 11, 2016.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend a Garden party celebrating the Queen’s 90th birthday on April 11, 2016 in New Dehli, India.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit Gandhi Smriti, a museum located in Old Birla House, where Mahatma Gandhi, India’s founding father, spent the last few years of his life, on April 11, 2016 in New Dehli, India.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive for a Bollywood Inspired Charity Gala at the Taj Mahal Palace Hotel during the royal visit to India and Bhutan on April 10, 2016 in Mumbai, India.

Britain’s Prince William, watches as his wife Kate, the Duchess of Cambridge, plays soccer during their visit to a slum in Mumbai, India, Sunday, April 10, 2016.

The Duke of Cambridge, Prince William, plays cricket during a charity event at the Oval Maidan in Mumbai, India, Sunday, April 10, 2016.

Britain’s Prince William, right, the Duke of Cambridge, and his wife Kate, the Duchess of Cambridge, walk together as they pay tribute during a visit to Gandhi Smiriti, an Indian museum dedicated to Mahatma Gandhi in New Delhi, India, Monday, April 11, 2016.

Britain’s Prince William, right, the Duke of Cambridge, and his wife Kate, the Duchess of Cambridge, speak each other as they pay tribute during a visit to Gandhi Smiriti, an Indian museum dedicated to Mahatma Gandhi in New Delhi, India, Monday, April 11, 2016.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive for a Bollywood Inspired Charity Gala at the Taj Mahal Palace Hotel during the royal visit to India and Bhutan on April 10, 2016 in Mumbai, India.

Catherine, Duchess of Cambridge looks on as she lays a wreath to honour the soldiers from Indian regiments who served in World War I at India Gate on April 11, 2016 in New Dehli, India.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit Gandhi Smriti, a museum located in Old Birla House, where Mahatma Gandhi, India’s founding father, spent the last few years of his life, on April 11, 2016 in New Dehli, India.

Britain’s Prince William (C) and his wife Catherine (L) receive a traditional welcome as they visit the historic Banganga water tank in Mumbai on April 10, 2016.

Britain’s Prince William,Duke of Cambridge along with his wife Catherine,Duchess of Cambridge walk behind a wreath laying party as they their tributes at the India Gate war memorial, in the memory of the soldiers from Indian regiments who served in World War I, in New Delhi on April 11, 2016.

Former Indian cricketer Dilip Vengsarkar looks on as Catherine, Duchess of Cambridge(R)and an unseen Britain’s Prince William, Duke of Cambridge play a game of cricket with Indian children who are beneficiaries of NGO’s at The Oval Maidan in Mumbai on April 10, 2016.

Britain’s Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge pose during a visit to Gandhi Smriti, an Indian museum dedicated to Mahatma Gandhi in New Delhi on April 11, 2016.

Britain’s Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge greet Indian children who are beneficiaries of NGO’s at The Oval Maidan in Mumbai on April 10, 2016.

Britain’s Prince William, left, along with Kate, the Duchess of Cambridge, talks with staff members at Hotel Taj in Mumbai, India, on April 10, 2016.

Britain’s Prince William waves as he arrives at Hotel Taj in Mumbai, India, on April 10, 2016.

Prince William, center in white, and his wife, the former Kate Middleton, speak with former Indian cricketer Dilip Vengsarkar, third right, during a charity event at the Oval Maidan in Mumbai, India, on April 10, 2016.

The Duke and Duchess of Cambridge walk with officials during a charity event at the Oval Maidan in Mumbai, India, on April 10, 2016.

The Duke and Duchess of Cambridge listen to children sing during a charity event at the Oval Maidan in Mumbai, India, on April 10, 2016.

Prince William, and his wife, Kate, lay a wreath on the martyrs memorial at the Taj Mahal Palace Hotel in Mumbai, India, on April 10, 2016.

Prince William and his wife, Kate, arrive to lay a wreath on the martyrs memorial at the Taj Mahal Palace Hotel in Mumbai, India, on April 10, 2016.

Prince William, and his wife, Kate, after laying a wreath on the martyrs memorial at the Taj Mahal Palace Hotel in Mumbai, India, on April 10, 2016.