The Lily Savage star died “unexpectedly but peacefully” on Tuesday night at the age of 67.
Remembering his other half, the 41-year-old shared the image, taken from their final holiday in January, on Instagram on Thursday and thanked fans for their outpouring of support.
Portasio, who married O’Grady in 2017, wrote: “In time I hope to write to everyone individually and thank you for all posts, messages, phone calls, emails, cards and flowers of support.
“I much appreciate you all taking the time to reach out. I’m so very touched and I’m sure Paul would be too!
“Browsing for a picture, I found the last picture we ever took together. Unbeknownst to us back in January this would be our last ever holiday together.”
O’Grady’s close friend Linda Thorson revealed that the presenter died in his own bed with his husband next to him.
And Thorson, 75, paid tribute to O’Grady, who she met while he was a presenter on The Big Breakfast, during an appearance on Thursday’s Good Morning Britain.
“But he died in his own bed. His husband was there, Andre, who he’s been with for so many years. The most divine man.
“He’s only 41, Andre. He will be so bereft. He worshipped Paul. He gave a speech at Paul’s 60th birthday. And Cilla [Black] was there, Barbara Windsor. They’re gone.
“They’ll all be partying in heaven you know – and the Queen.”