Meghan played Rachel Zane in the hit legal drama alongside Patrick, who played her on-screen partner Mike Ross.
The show follows the fortunes of a fictional New York City law firm and starred Meghan from its launch in 2011 until her final episode in 2018.
The ninth and final series of Suits will air in the US on Wednesday, prompting Patrick to take a trip down memory lane with throwback pictures of the programme’s stars over the years.
“This week the last episode of Suits will air and the nearly 10 year journey we’ve all been on together will finally be over,” he wrote.
“So it seems right to post some photos the next couple of days from the early days.”
He then shared collections of images on his social media page, including one shot of Meghan against a red background along with the caption “RZ” in reference to her former character’s name.
There were also pictures of Meghan on the set of the programme, including a picture of her in her character’s famous cami and pencil skirt combination.
A swipe through the images revealed one shot of her reclining on a sofa and another of her in a bathrobe.
There was also a picture of her lying on the floor with her legs in the air against a cabinet alongside co-star Sarah Rafferty, who plays Donna Paulsen.
In the show, Mike and Rachel had married before moving to Seattle.
Meghan announced she was quitting the legal drama shortly after getting engaged to the Prince Harry, and her last episode aired around a month before their wedding.
Patrick was among the Suits stars to attend the Duke and Duchess of Sussex’s wedding in May last year.
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