According to royal biographer Tina Brown, Harry was convinced to sought help from a doctor from the secret service by his then-girlfriend Cressida Bonas.
In recent years, the Hampshire-born 'It-Girl', who is expecting her second baby with husband Henry Wentworth-Stanley, 35, has forayed into writing and creating content.
The British actress, who dated Prince Harry from 2012 to 2014, took to her Instagram account on Wednesday to announce that Lessons From Our Mothers will be launching on March 30.