Thelenius became familiar to Swedish TV viewers as a housemate on Big Brother in 2003; the series was aired on Kanal5 where she made headlines for having sex on live television.

[1] She also worked as a glamour model after her stint on Big Brother for men's magazines such as Slitz.

[2] She took part in Michael Brinkenstjärna's television show Team Paparazzia along with Meral Tasbas.

[4] Thelenius along with her daughter Melissa went on the paranormal show Det Okända on Sjuan in 2011 to get help with ghostly activity in their apartment.

However, a few months later she revealed that she would participate in a yet unnamed country's national selection for the Eurovision Song Contest, a statement she later retracted as she claimed she did not want to perform and sing live.

[6][8] According to Aftonbladet, Thelenius brought in 203,000 ballots with 255,000 being the needed minimum to make it through the 4% barrier to the Riksdag, the Swedish national legislative assembly (Parliament).

[11] In another interview on 27 June 2007, Thelenius declared that she had not accepted the offer in the end and declined to travel to Barcelona and that she would not be doing any pornographic material.

[12] In 2006, Thelenius made her debut as an author with the autobiography Den nakna sanningen which she co-wrote along with host and journalist Daniel Nyhlén.