The ex-Australian cricketer proposed on Friday night after a whirlwind ten-month romance.
And over the weekend the couple looked blissfully happy, with 46-year-old Hurley flashing a sapphire and diamond engagement ring said to be worth £50,000 (Dh286,067).
But one friend said on Sunday: "A lot of us are very surprised — and a bit concerned for Liz. What started out as a fling has become something far more. They seem to have got caught up in the moment. However much chemistry there is between Shane and Liz, they are from very different worlds. She is very much part of upper-crust society, and he is a Jack-the-lad Aussie."
Bookmaker William Hill is giving odds of 3-1 that he and Hurley never make it up the aisle.
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