The record before him was held by Pope Francis, who reached the million mark in 12 hours after launching his channel "franciscus" in 2016. At the time of publication, the account had 3 million followers.
Pay no attention to Hollywood stars or pop idols.
"Welcome to our official Instagram; we look forward to sharing the work that drives us, the causes we support, important announcements, and the opportunity to shine a light on key issues", the caption read.
During his visit, Harry learned about how the YMCA, in the London suburb of South Ealing, is supporting young people in the area and took part a roundtable discussion convened by The Royal Foundation's "Heads Together" campaign - the mental health initiative spearheaded by the royals.
The new account has prompted questions as to whether the public will get its first glimpse of Baby Sussex on Instagram.
Chicago makes history with election of first black female mayor
But as Van Dyke was about to go on trial for murder in September, Mr Emanuel announced he would not run for re-election. Ross said she believes Lightfoot will be better able to clean up the police department and curb city's violence.
In others, Meghan embraces two women at the launch of the Hubb Community Kitchen cookbook, a charity with which she is passionately involved, and Prince Harry is pictured assisting a conservation team with a sedated elephant on a wildlife reserve in Malawi.
The only member of the royal family to have their own social media is Prince Andrew, Duke of York, who is Harry and William's uncle.
As Meghan Markle, Duchess of Sussex, and Prince Harry, Duke of Sussex, prepare for the imminent arrival of their first child, they've been in the midst of a great deal of transition within the royal fold. News. This move also comes shortly after Buckingham Palace, Clarence House and Kensington Palace published guidelines for interacting with the royals via their official accounts.
For those wondering why Meghan and Harry do not yet have their own dedicated Twitter account, Proctor said: "I should imagine within the next few weeks, the Sussex family will open their own Twitter account too".
"I suspect Harry and Meghan's team is waiting for their username of choice to become available".