Lubomirski has previously spoken out about what it was like working with the couple when he took their engagement photos at Frogmore House, Windsor, noting that it was a "joyful" shoot.
The "Walking Away" hitmaker said: "Listen, if I got invited to witness one of the most biggest talking points of modern history when it comes to the royal family, it would be unbelievable to be there".
Queen Elizabeth's 33-year-old grandson, Harry, fifth-in-line to the throne, and Markle, 36, who starred in the US TV legal drama Suits, will marry in Windsor on May 19.
Meghan Markle and Prince Harry are due to marry at St George's Chapel at Windsor Castle on May 19.
Lubomirski, who photographed the couple for their official engagement photos at Frogmore House previous year, will take the wedding portraits at Windsor Castle after the ceremony.
The other 600 guests are expected to be people with whom Meghan and Prince Harry have a direct relationship and considered appropriate for their wedding.
Harry and Meghan will be in good hands as Alexi has worked with loads of famous faces.
"They were so deliciously in love", he told E!
In an earlier interview with Lubomirski, the photographer said that the initial engagement photos he took for Prince Harry and Meghan Markle actually came out of nowhere, as he was in England when the announcement was made.
This latest wedding tidbit comes just days after more details about the guest list were revealed.
Royal fans could even order a version of their own, as the London based bakery's website features a special orders menu, with a very similar sounding cake.