However, Jessica - who recently divorced husband Nick Lachey after three
years of marriage - recently stopped undergoing the procedure because the
injections were ruining her "natural looks".
She said: "It looked fake and I didn't like that. The trouble is that it
takes a while to go away but now my lips are getting back to how they used
to look, thank God."
Jessica, 26, claims she felt "under pressure" to have the injections to
maintain her youthful looks.
She explained: "Last year, I definitely felt under pressure about my looks
so I did try out filler stuff for my lips."
It appears it is not just her lips that Jessica has been obsessing about.
The actress recently revealed she loves her "perfect" breasts.
She said at the time: "I have amazing boobs. They're just perfect."
In other news, Jessica Simpson is "head over heels" in love with new beau John Mayer, according to People Magazine.
The Texas-born songbird has hit it off with fellow singer-songwriter Mayer, it has been claimed.
"She's head over heels," an insider told People magazine. "She's telling friends 'I'm in love."
"I love John Mayer," Joe, who is Jessica's manager, told the magazine.
"I love his music, I love his talent.
"The last time he was at the House of Blues in L.A, I went by myself to see him play.
"If my daughter's happy, then I'm happy.