Fletcher claimed that he "would definitely not have put... up" his musical tribute to wife Giovanna Falcone if he had known details of the Strictly Come Dancing winner's wedding to Izzy Johnston would be published on Monday (January 7).
"I read that article about me posting it to try and "steal Harry's thunder". I had no idea his wedding article was coming out this week!" he wrote on Twitter.
"If I'd have known I would definitely not have put it up. I only got our wedding video the week before Harry's wedding so I couldn't post it...before. The Judd's wedding was before Christmas so thought it was safe to do it now. Ooops! Sorry. No harm intended!"
He concluded: "Sooooo, check out Harry's wedding pics in Hello this week. 'twas a gorgeous wedding for two gorgeous people."
Fletcher also expressed surprise that his speech has clocked up almost 700,000 hits on YouTube.
"Er, can't believe how many views my wedding speech has had," he said. "I only really put it up to share it with family…ha!"
Fletcher and Falcone married at London's One Marylebone in May.