Fry and Spencer, a writer, reportedly began dating last year. The two have remained private about their May-December romance, though Spencer did post this group photo of the two alongside actress Emma Thompson in August.
He also tweeted about meeting Fry in July.
According to the BBC, Fry has already filed the paperwork to wed Spencer at a register office in Dereham, Norfolk, which is near where he grew up.
"Stephen Fry is very happy and proud to say that he has set the wheels in motion for a wedding sometime in the future but no date has been set due to a busy work schedule," his assistant tells the BBC.
It's particularly good news for Fry -- who besides being famous for narrating all seven of the Harry Potter audiobooks, and for memorable U.S. television roles in 24 and Bones -- is known for being open about his struggles with bipolar disorder and depression. He won an Emmy for his 2006 documentary Stephen Fry: The Secret Life of the Manic Depressive, which explored the effects of living with bipolar disorder based on his own personal experiences.
Though these days, Fry is crying happy tears.
"Your adorable tweets are bringing me close to sobbing," he tweeted on Tuesday after he was flooded with congratulatory messages.
Your adorable tweets are bringing me close to sobbing. Off for a walk and a blast of Jorge Bolet (thanks to @JRhodesPianist’s ace present)