The singer, 63, admitted that she had used the anti-wrinkle treatment in the past, but said she does not do so any longer.
The Sun quotes her as telling Piers Morgan on an upcoming episode of Life Stories: "You can check behind my ears if you want. I used to get Botox and fillers but not anymore.
"My skin care company, Time Bomb, is also the reason. I spent so much time on skin care it eventually became a project.
"And also people think I look younger now because I used to look so much older when I was young!
"Whereas Brigitte Bardot and beauties like her peaked in their twenties, I certainly didn't - so I had room to improve my style over the years."
Lulu and professional partner Brendan Cole were the fifth couple to be knocked out of last year's series of Strictly Come Dancing.
> Robbie Williams 'would sleep with Lulu, Brad Pitt, Santa'