Sarah Edwards, 34, matched with Paul Edwards, 36, on a dating app, and just days later they had the "crazy" idea to have a shotgun wedding.
Sarah (née Elliott), who still lives with her ex-partner, said she and Paul are like "best friends" already and they've discussed having children, despite only knowing each other for less than two weeks.
But they don't know how their families will react - as neither has told their loved ones about the wedding.
Sarah said a lot of her friends are "disowning" her but she doesn't care and she's certain the marriage will work out.
Sarah and Paul matched online on December 15 and exchanged messages and spoke to each other for the first time on December 22.
The loved-up couple spoke again on the 23rd had decided to marry - despite never meeting face-to-face.
They committed to each other and booked a wedding venue at the Bellagio Hotel and Casino.
Meeting for the first time at Gatwick Airport on Christmas Eve, the duo boarded a plane in full wedding gear and jetted off to Las Vegas to get married.