Prince Harry secretly visited the set of Suits, his girlfriend Meghan Markle's television show, on Wednesday when he quietly flew into Toronto a few days early.

According to the Daily Mail, Harry apparently met the cast and crew of the US legal drama and proudly watched Meghan in action.

"Everyone was so excited," a source told Hello! Canada.

"He was super low key, met some crew and was so happy to watch his lady."

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Kensington Palace declined to comment. News of the visit emerged as the prince braved forty degree humidity to greet hundreds of competitors at the start of the Invictus Games today.

Although hopes were high that he would be accompanied by Miss Markle, the royal arrived at the York Lions Stadium just outside of the city alone.

The previous evening he and Miss Markle, 36, had appeared at the same official event - the opening ceremony for the games - although they were careful not to be photographed together.

Meghan Markle attends the opening ceremony of the Invictus Games Toronto. Photo / Getty Images
Meghan Markle attends the opening ceremony of the Invictus Games Toronto. Photo / Getty Images

In her absence, Harry, fifth in line to the throne, and dressed in jeans and his black Invictus polo shirt, watched one or two races on the track, handed out several medals and then made a point of meeting as many servicemen and women as possible in their preparation area.

The Invictus Games are an inspirational Paralympic-style event for injured service personnel, created by the prince.

Some 550 competitors from 17 nations are taking part in 12 adaptive sports such as tennis, golf and basketball.