Botox has become so common that many Hollywood celebrities don’t bother disputing the fact that they’re using it.

Case in point: the Nov. 24 edition of People magazine, which gives a run-down of more than a dozen actresses and other celebrities who are Botox believers – and talkative too.

These wrinkle-fighters range in age from Jenny McCarthy (pictured at right) and Jennie Garth, both 36, to Annie Potts and David Hasselhoff, both 56.

That list doesn’t even include the most prominent example of a Botox backer. She is actress Virginia Madsen, 43, official celebrity spokeswoman for Botox.

Many of the actresses not only say they’ve been injected, they also have advice about how to use it. Several share the same advice – ask the doctor to inject only small amounts of Botox so your face won’t freeze up:

SMALL QUANTITIES

Jenny McCarthy, 36, B-movie actress, Playboy model and author, says she makes sure her doctor injects only a modest amount. “If you overdo, it looks bad,” she says. That requires her to return for injections every two months, rather than the usual three to four months. “I believe in just a little bit. It allows you to keep that mobility in your face. It’s a great little secret.”

Sharon Osbourne, 56, of “The Osbournes: Loud and Dangerous” is a longtime Botox user. “A lot of women [went] too far,” she says. “If you take the natural lines out of your face, you look like you’ve been starched.”

Vanessa Williams, 45, of “Ugly Betty”: “I use it very sparingly,” she says. “I want to look natural.” She schedules Botox shots for every three months, she says. “I get it so I look serene.”

Jennie Garth, 36, of “90210” says her first doctor injected her with too much Botox, so she asked for a different dose the next time around: “I said I wanted way less. I don’t want my face to change.”

Daisy Fuentes, 42, former MTV host: “There’s a right time for things like Botox as you get older. As long as you don’t go overboard with it, then you’re good.”

IFFY

Brooke Shields (pictured at right), 43, says she tried Botox once and is undecided whether she will do so again. “Talk to me in a year,” she says.

ROUTINE

Annie Potts, 56, formerly of “Designing Women,” uses Botox and predicts it will continue to grow in popularity because actresses need “to look as young as you can, for as long as you can, so you can pay the rent.”

Simon Cowell, 49, of “American Idol”: “To me, Botox is no more unusual than toothpaste. It works; you do it once a year. Who cares?”

David Hasselhoff, 56, of “America’s Got Talent”: “I have had Botox. Everyone has. It’s a shot. It takes out the frown. I did it before a movie.”

Linda Evangelista (pictured at right), 43, model, says she uses Botox because “models are not superhuman. We grow old.”

Model Janice Dickinson, 53, says, “I started Botox the first year it came out. I was the first one in line, and I have had Botox every six months since then.”

Lisa Rinna, 45, formerly in “Days of Our Lives” and “Melrose Place,” says she has Botox shots every three months because “in my family, it’s hereditary to have scowl marks between the eyebrows.” Botox, she says, “smooths everything out.”

Lori Loughlin, 44, of “90210”: “The results are incredible. It makes you look like you’ve been on a really nice vacation. Just really well-rested.”

NO WAY

Many actresses reject the idea of using Botox, but the People article quotes only two of them. One is Courteney Cox, 44, formerly of “Friends,” who says she tried Botox and hated what it did to her.

The other is Teri Hatcher, 43, of “Desperate Housewives”: “In the past, I’ve had Botox and collagen, but I don’t plan to [get it again]. It needs to be okay to have wrinkles as I age.”

Prominent opponents of Botox injections include Cate Blanchett, 39, and Sarah Jessica Parker, 43.

NO COMMENT

Also missing from the People article are celebrities who are obviously using Botox, but don’t admit it. Among the actresses that cosmetic doctors say are Botox beneficiaries are Madonna, 50, and Nicole Kidman, 41.

They were the two actresses whom readers of this blog labeled “most medically enhanced” in a survey in the post “The world’s most powerful Botoxed celebrities.”

Take a look at our slide show about many of the “Botoxed beauties” listed above, then cast your vote in the following reader survey:

Related links:

• Selma Blair isn’t wrinkled enough for Botox or plastic surgery, she says
• Susan Sarandon might get a neck lift, but not Botox
• Men say women look best with no breast implants, no Botox
• Nicole Kidman’s new look, pregnant and Botox-free
• Biden denies plastic surgery, but docs see signs of Botox
• Consumer’s guide to Botox and other wrinkle fighters

Slide shows:

• Botoxed beauties
• Top celebrity slide shows of all time
• Cindy McCain photos highlight cultural divide
• Tara Reid’s career as she copes with bad breast surgery
• Cindy Crawford’s enduring appeal
• Angelina vs. Halle vs. Ava

For more on celebrities and cosmetic medicine, see links on the right side of this blog.