Wayne Lineker has shared a snap of himself with Celebs Go Dating co-star Chloe Ferry - with a ring on her finger.
"She said YES!" the star wrote, "Love you @chloegshore1."
While there's no denying they were solid friends in the mansion, in the comments fans have speculated that it's a prank by the new pals.
Sean Lineker - Wayne's son - led the congratulations, writing: "Congrats! Can’t believe we had to keep this secret for so long !! Xx"
Co-star Curtis Pritchard added: "go on Wayne congratulations, big man, hahah love bro love!"
And Billie Jean Blackett, another of the stars, wrote: "You guys deserve to be happy."
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Chloe also re-shared Wayne's post on her own Instagram Stories, and some reckon they spied the very same ring on a post Chloe shared yesterday.
But others aren't so convinced.
Chloe was recently linked to hunky model Kieran Bishop, whom she met on Celebs Go Dating, suggesting that snaps are a prank.
And some pointed out that the photos look like they were taken in the Celebs Go Dating mansion.
Wayne has also previously shared a snap of the two of them, captioning it: "Shame I'm not allowed to date the celebs."
If they really are engaged, they wouldn't be the first celebs to strike up a romance in the mansion, after Made In Chelsea's Sophie Hermann and DJ Tom Zanetti coupled up.
Meanwhile, Wayne addressed the age gap between himself at 58 and 25-year-old Chloe - confronting one commenter who said Chloe was "marrying an old man."
Wayne was having none of it, writing back: "Ageism is not a nice thing, you really shouldn't try to publicly humiliate someone."
He added that those who've suffered abuse can contact No Excuse For Abuse for help and guidance.
The Mirror has contacted reps for Wayne and Chloe for comment.
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