"Oh. It looks as though a certain cat is out of a certain bag. I'm very very happy of course but had hoped for a private wedding. Fat chance!" Fry, 57, tweeted gaily.
The Daily Mail and People, among others, helped fill in the blanks on the pending wedding, expected later this year.
The BBC reported the duo filed paperwork for the wedding at the register office in Dereham, Norfolk, near where Fry grew up.
The boyfriend is Elliott Spencer, a stand-up comic, who's helped bring back cheer into Fry's life after years of downers, such as drug addiction, a 2012 suicide attempt and a painful split from a former longtime partner in 2010.
All of this is chronicled in Fry's autobiography,More Fool Me, published in September, in which he confides that "I got high" snorting coke at Buckingham Palace, Windsor Castle, royal country estate Sandringham, the BBC, the House of Commons, the House of Lords, and a number of London newspaper offices.
But Fry is one of those beloved British entertainment treasures. He's best known over here for his appearances in wacky Brit series such as Dr Who and Blackadder, roles in Gosford Park, the Harry Potter and The Hobbit movies, stage roles in Shakespeare, and roles in U.S. series such as 24 and Bones.
He once played Oscar Wilde, started out as the comic partner of Hugh Laurie (they met in college), and he's such a good friend of Prince Charles' that he attended his 2005 wedding to Camilla Parker Bowles.
Fry and Elliott were spotted Monday looking very happy together, wearing matching engagement rings, outside Fry's posh London home. Minutes later, Spencer accidentally scraped the side of Fry's $240,000 Bentley as he maneuvered the car out of a narrow garage. Ooops.
But nothing could detract from Fry's joy, according to his tweets.But soon the paparazzi had showed up at his door, "door-stepping" as the Brits call it. What to do? Suggestions flowed into his Twitter feed, "everything from sandwiches to Rottweilers." He chose coffee. Wrong choice.
