The singer's management team are said to have contacted the force over sinister tweets warning that Lee would be attacked when he left the house.
"You say you like damaged girls - I'm going to damage you when you come out of the house #stabyou #damage," one message read.
"The threats are too serious to ignore," a source said. It's terrifying to think people are prepared to go that far.
"Lee was expecting some viewers not to like him but it is getting too extreme.
"He's not perfect but he doesn't deserve threats like this."
Poor Lee already found out that the public weren't too keen on him during last week's fake eviction when the Blue star temporarily left the house to face a booing and jeering crowd.
But it seems as though things have only got worse since then with an insider telling the Daily Star Sunday newspaper today: "Threats of stabbing are incredibly worrying for everyone who works with Lee and for his friends and family.
"His team wanted to flag it up with police so it can be dealt with appropriately."
Meanwhile, Lee's mum Sheila has jumped to her son's defence over his house antics.
Lee, who's been branded a 'love rat' after jumping between girls in the Celebrity Big Brother bungalow, returned to the main house in Friday night's live show after living in Bolt Hole with Casey Batcher.
Sheila told the Daily Mirror newspaper: "He is a young man and having been chained to a beautiful girl I think he may have acted in a way that all men would.
"They are both lovely girls and have different qualities which Lee would like to be condensed in one person, so it makes it very confusing for him.”
Celebrity Big Brother airs nightly on Channel 5.