Nadia is the hottest ever favourite to win Big Brother.
The Portuguese transsexual is now 50/1 on – after starting the show as a 50/1 outsider.
Shell is the bookies’ favourite to get booted out next.
Viewers have been voting all week for the housemate they want to win.
Unbeknown to the five in the house, the one with the least votes will leave tomorrow night in a shock eviction.
Ladbrokes spokesman Warren Lush said: “We have little doubt that Nadia will win. She’s the hottest favourite to win we have seen in any series.
“Cameron Stout was 1/10 to win on the eve of last year’s final night, while Brian Dowling was 1/16 in series two. We can’t see any other housemate making a challenge, it’s Nadia all the way.
“We’ve been forced to slash her odds to 1/50 and we don’t want to take any more money on her. The change in her fortunes since the start of the show is remarkable.”
He added: “Shell is favourite to go next. Even a session of naked lawn mowing is unlikely to save her.”
Dan and Jason are 16/1 to win, followed by Stuart at 33/1 and Shell at 50/1.