Did you know Avril Lavigne was replaced by a lookalike named Melissa in 2003?
The theory says because her supposed "death" occurred at the peak of her career, Ms Lavigne's record company hired a lookalike known as Melissa Vandella to impersonate her. Vandella was reportedly recruited prior to pose as the Canadian singer for paparazzi, the theory continues.
As of writing, the conspiracy theory thread on Twitter now has over 124,000 retweets and nearly 200,000 likes.
Were you ever obsessed with Avril Lavigne as a spry young tween and are pretty devo you don't see her and her oversized pants around anymore? "She grew up. And you need to if you believe the conspiracy". The differences between her first album - which included hits like "Complicated" and "Sk8er Boi" - stand in stark contrast to the music she created thereafter, including everything from 2007's "Girlfriend" to 2014's "Hello Kitty".
However, while working on her second album, it's claimed that Avril fell into a depression and was later found dead at her home. There was even a photo of Avril from a photoshoot with the name Melissa written on her hand.More news: Trump Taps Callista Gingrich to Be Ambassador to the Vatican
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A blogger said: "Launched in 2004, it is completely different to the first CD!" But when Lavigne's grandfather died, she got depressed and killed herself - making Melissa take over her life as "Avril Lavigne". It's an album full of subliminal messages apparently left by the "New Avril". Avril Lavigne is active on Twitter and the internet crowd helped themselves with this opportunity.
Ms Lavigne is active on social media platforms and her latest tweet on 14 May is a snap of herself and her mother on the occasion of Mother's Day in the United States and Canada.
In an era where traditional sources of news and information are being questioned, Dr Rosewarne said people are more accepting of alternative sources of "information". Some of the top responses to her tweet were: "Happy Mother's Day, Melissa" and "Melissa, it's okay. The jig is up Melissa".
Avril herself has yet to comment on the conspiracy theory.