It looked like a day that went perfectly - but a new book claims that there was tension between Meghan Markle and the queen in the run-up to the royal wedding.

Meghan and the monarch reportedly fell out over which tiara she would wear for the occasion. The bride-to-be was invited to choose one from royal's jewellery collection and had her heart set on an emerald tiara that was reportedly bought by Queen Mary from Russian nobility in the early 20th century. Because she couldn't be sure where it came from, the queen is said to have refused Meghan, prompting a "heated exchange." "Meghan had her heart set on this tiara with emeralds and Prince Harry hit the roof when they were told it was impossible for her to wear it," royal reporter Robert Jobson's book claims. "The provenance of the tiara could not be established. There were concerns it could have come from Russia originally. “There was a very heated exchange that prompted the Queen to speak to Harry. "She said, ‘Meghan cannot have whatever she wants. She gets what tiara she’s given by me’. “The queen also questioned why Meghan needed a veil for the wedding, given it was to be her second marriage. “The message from the queen was very much Meghan needed to think about how she speaks to staff members and be careful to follow family protocols.” Meghan ended up wearing a diamond and platinum tiara from the queen's collection. In a recent interview for an exhibition on the wedding, Meghan said getting to pick a tiara for her big day was "surreal". Harry added that it was a very sweet gesture by his granny. "Every girl's dream is to be able to try on a tiara and, funnily enough, it was the one that suited the best, the one that looked the best on you without question," he said. "I shouldn't have really been there, but an incredible loan by my grandmother, it was very sweet."