The couple shot the image in the presidential suite at the Amsterdam Hilton Hotel in The Netherlands, where Lennon and his wife posed for the camera in 1969.
The Come Together T-shirts they wear in the image have been donated to War Child to support the charity's work protecting children in war zones. The shirt is an exact replica of the one Lennon wore at the Cannes Film Festival in 1971.
Professor Green says, "It's great to be involved in recreating such an iconic shot with Millie. The T-shirt is in aid of a fantastic cause and carries a strong message that hopefully everyone will get behind!"
The new Come Together charity T-shirts are available at selected U.K. River Island stores and online.