She started dating Danny in late 2009, shortly after he split from her Miss England successor Laura Coleman.
Shortly afterwards the former beauty queen, 26, posted the same picture on her page, excitedly writing, "Soooo this happened tonight!! His bandmate Tom Fletcher was the first to walk down the aisle in May 2012 when he married Giorgina Falcone, the sister of champion Harry Judd was the second member of the band to marry, when he exchanged vows with Izzy Johnston in December 2012.
Bride-to-be Georgia is a former beauty queen who was crowned Miss England in 2007.
And bandmate Tom Fletcher, who's equally renowned for his insane cuteness after he sang his speech to wife Giovanna at their wedding, confirmed Danny's intense emotion.
"I thought Danny was going to pass out," he told the magazine.
Georgia Jones (nee Horsley) strips down to her fancy underwear as it is revealed she is the host of this year's UK Lingerie Awards.