Clarence House confirmed the news on Twitter today:
"Prince Harry and Ms Markle became engaged in London earlier this month.
Prince Harry has informed The Queen and other close members of The Royal Family.
The wedding will take place in spring 2018. Further details will be announced in due course.
Prince Harry and Ms. Meghan Markle will appear for a photo call at Kensington Palace later this afternoon. Stay tuned!
The couple will also take part in a broadcast interview to be aired this evening UK time."
Meghan's parents have also released a statement:
Prince Harry, 33, confirmed his relationship with the Suits actress in November last year after releasing a rare statement where he slammed what he called the racist and sexist abuse she has endured since her relationship with him was revealed.
Markle, 36, broke her silence on their romance in the October 2017 issue of Vanity Fair.
“I can tell you that at the end of the day I think it’s really simple,” Markle, 36, said. “We’re two people who are really happy and in love.
“We were very quietly dating for about six months before it became news, and I was working during that whole time, and the only thing that changed was people’s perception. Nothing about me changed. I’m still the same person that I am, and I’ve never defined myself by my relationship.”