The female illusionist opened tonight’s live show with a mesmerising performance in which she was put in a box by three hooded figures, only to appear a moment later outside the box in a cloak.
At no point did it appear that she left the box and yet she appeared to be the one on stage.
However, many audience members think they have figured out how she managed to do it and took to social media to discuss their theories.
"Ummmmm, you saw her climb out the box and hide under the cloak and run off stage…” posted one person on Twitter.
While another wrote: “When you see a magic trick where the assistants are wearing hoods/robes, it's always a distraction for the magician to slip off stage #BGT.”
A third wrote: “Someone else please tell me they noticed she went into the bottom box and those hands were legit so fake #bgt.”
Josephine Lee's trick left viewers suspicious on Britain's Got Talent
Josephine Lee is forced into the box on Britain's Got Talent and casts a spell
Ummmmm, you saw her climb out the box and hide under the cloak and run off stage…
Britain's Got Talent viewer
Sadly Josephine failed to make it into the final, instead it was pianist Tokio Myers and pint-sized comedian Ned Woodman who made it through to the Britain's Got Talent final.
They will be joining mind reading duo DNA, singer Kyle Tomlinson, Issy Simpson and comedy magician Matt Edwards.
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There was shock as Simon Cowell’s Golden Buzzer act Sarah Ikumu was eliminated from the competition when she came third.
Josephine Lee is forced into the box on Britain's Got Talent Britain's Got Talent: Most memorable moments Mon, May 1, 2017
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Josephine Lee reveals herself on Britain's Got Talent
The 57-year-old was visibly stunned as teen was knocked out after previously being one of the favourites of the ITV show with backing from US star Jennifer Hudson.
As the credits rolled on the ITV episode, the music mogul was seen going up on the stage to talk to the singer.
Britain’s Got Talent continues on ITV tomorrow at 7.30pm.