Kate Middleton_ Primce William
Prince William and the Duchess of Cambridge sit in front of the Taj Mahal on the last day of the royal tour of India and Bhutan in Agra, India, April 16, 2016. Getty Images/Ian Vogler/Pool

Kate Middleton and Prince William will be celebrating Queen Elizabeth II's 90th birthday Thursday, the Kensington Palace said Monday. The Duke and Duchess of Cambridge will have "a busy couple of weeks ahead" after completing their seven-day royal tour of India and Bhutan.

According to the Seattle Times, the longest-reigning monarch in British history does not plan to have a major celebration Thursday. The queen will reportedly spend the day unveiling a plaque to mark the start of the four-mile Queen's Walkway in Windsor before joining the Duke of Edinburgh to meet members of the public.

The Kensington Palace also announced that William, along with Prince Harry and the President of the BAFTA, will visit the "Star Wars" film set at Pinewood Studios in Buckinghamshire Tuesday. The film's crew is currently working on the eighth installment of the "Star Wars" film franchise.

Kate and William, who wrapped up their royal visit to India and Bhutan with a private tour of Taj Mahal in Agra, India, on Saturday, had huge success from the tour in deepening Britain's ties with India.

The royal couple visited several iconic places during their tour, including the Taj Palace Hotel, one of the scenes of the 2008 Mumbai terror attacks. The couple spent time in New Delhi and also enjoyed a tour to Assam’s famed Kaziranga National Park in the country's northeast.

In Bhutan, the royal couple met the king and queen of the remote Himalayan kingdom. The couple played archery, enjoyed a private dinner with the King Jigme Khesar Namgyal Wangchuck and Queen Jetsun Pema, and embarked on a six-hour trek to the Tiger's Nest Monastry.

After concluding their visit to Bhutan Saturday, Middleton and William visited the Taj Mahal where they posed at the famous stone bench, known as “Lady Di’s Chair,” where 25 years ago, the late Princess Diana was pictured. Kate reportedly got “emotional” while visiting the Taj Mahal, their tour guide, Rizwan Mohammed, told Us Weekly.