The duo have been dating since last year, and rumours of an engagement have been swirling ever since Oliver was seen wearing a ring on her hand a month ago.
In an author to author chat with Marian Keyes for The Guardian, Keyes outright asked Osman if he was "getting married", to which he said: "Yes. Exciting, isn’t it?"
Speaking about the couple's relationship last year, Osman said: "[I'm] now in a place where I want to be. I'm happy with myself, I've got these beautiful kids, I've met the woman who I'm going to be with for the rest of my life.
"That thing of competition and ambition, you soon realise that rocket fuel disappears and it's about happiness and my kids bring me happiness and Ingrid brings me happiness."
Osman was previously in a relationship with jazz singer Sumudu Jayatilaka, and has two children from that relationship.
Beyond his TV work, Osman has released two incredibly strong-selling novels in a fictional crime series, The Thursday Murder Club and The Man Who Died Twice, which has just been released in paperback.
The Thursday Murder Club is being turned into a film, with the rights being bought by none other than Steven Spielberg.
When asked how he feels about the fact, Osman said: "Spielberg doesn't watch Pointless Celebrities, I don't know if that's news to anybody. He's not a huge Richard Osman's House of Games fan.
"So the fact that he read the book and thought that this is a great story, these are great characters, I want to make this a movie, it gave me real confidence that this is an actual proper book and not just some book written by a TV presenter."
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