The couple, who have an infant daughter together, got engaged Monday, Kardashian's 33rd birthday.
Although the divorced television personality has said in the past she would like a small wedding should she ever marry again, a source told E! News the ceremony during which Kardashian ties the knot with West is "going to be huge."
"It's going to be the size of the capital," the insider said. "There won't be anything small about it."