The 27-year-old, who won Channel 4's final series of the reality show in 2010, proposed to plumber boyfriend Luke Sanwo after just six months together.
"I feel like I've known Luke for years," she told New. "All my friends and family love him. He treats me like a princess.
"He's just so caring and lovely and laid-back. Nothing is a stress. And he can do anything. Nothing is too much hassle for him. He's just... perfect!"
Gibson was previously in a relationship with fellow Big Brother housemate John James Parton, but they split in March 2011.
The former couple clashed on Twitter back in December after Parton apparently refused to stop his fans abusing her.
> Josie Gibson: 'John James made fun of me'