While nothing has been officially confirmed, TMZ is reporting that she was found deceased at her home in the Earls Court area of West London, England on Wednesday (March 13).
She left behind two-year-old twins Ernest and Doris, now five, from her relationship with Daniel Deakin, plus four daughters - Louis' half-sisters - from her second marriage to Mark Tomlinson.
Louis and Felicite's mother died in December 2016 after a year-long battle with Leukaemia.
Other celebrities, including Westlife singer Brian McFadden, rallied around Tomlinson. "This boy has had it tough".
Family pictures show the singer with his fours sisters who have been supporting each other through hard times following the death of their mother.
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Felicite Tomlinson has tragically died aged 18.
Felicite had more than 1 million followers on Instagram and had recently said on social media that she had stopped drinking and smoking cigarettes.
The results of a full post-mortem examination will be released in days.
On January 30, she posted a picture of a row of tattoos on her forearm, which she said were the initials of all her siblings.
Her last social media post came on Sunday (March 10).