It’s a well known fact that to cut it in Hollywood you need a megawatt smile. But as celebrities often play their cards close to their chest when it comes to cosmetic procedures, it requires some super sleuthing and a couple of ‘before’ photos to work out whether in fact mother nature blessed them with great genes, or if they have had a helping hand in pursuit of the perfect pearly whites.

Here we take a look at some famous faces who have spent more than their fair share of hours in the dentist’s chair…

Demi Moore
As well as undergoing a rumoured $ 365,000 worth of plastic surgery over the years, Demi has completed the Hollywood package with a smile makeover. Her teeth have possibly been capped, a process which involves filing the teeth down and using dental cement to fit individual false teeth, usually made from porcelain, in their place. This has resulted in an even, bright white smile, a far cry from her General Hospital days.

Hilary Duff
Disney alumni Hilary famously had badly proportioned porcelain veneers fitted in 2005 resulting in a smile that was much parodied and likened to that of a horse. In 2008, her dental misdemeanours were corrected as her veneers, which are porcelain or ceramic coverings fixed to the front of the teeth, were reshaped and re-contoured. Hilary’s teeth are now a shining example of the perfect star smile.

Kirsten Dunst
Although once claiming to ‘love’ the uniqueness of her famous fangs, in more recent photos it appears that Kirsten has traded them for the textbook Hollywood grin. So are Kirsten’s new straight white teeth down to some clever airbrushing, or has she conformed to Tinseltown pressure and booked in with an orthodontist?

Other celebs rumoured to have undergone orthodontic treatment include Nicole Kidman, Miley Cyrus, Katherine Heigl and Katie Holmes.

And it’s not just the girls who are in on the act; take a look at some of Hollywood’s leading men who have invested in their smiles:

Tom Cruise
Famously, in 2002, the Top Gun star wore fixed ceramic braces to realign his bite. No longer just the domain of kids and teens, Tom’s braces have led to an increase in the number of adults, particularly men, undergoing treatment to fix their own imperfections and achieve the perfect smile.

Zac Efron
When High School Musical heart-throb Zac Efron traded his gappy front teeth to a full white smile, it marked his ambition to be taken more seriously and move from Disney territory to more grown up movies. So how did he achieve his new smile? It is possible that the gap in Zac’s front teeth closed naturally over time, or, that he had a helping hand in the form of veneers or Invisalign braces. Invisalign are clear, removable aligners, often used as an alternative to traditional fixed braces.

Ben Affleck too has undergone a smile overhaul, Michael Douglas had his teeth revamped back in the 80s and even Nicolas Cage appears to have undergone whitening procedures to add a little extra star quality to his smile.

So, watch out when you next see a big Hollywood star as they just have a different smile altogether!

Stephanie Meyer, look out! Actress-turned-popstar-turned-writer Hilary Duff has signed a deal to write young adult novels for publishing company Simon & Schuster.

The newly engaged 22-year-old has already penned her first novel, Elixir, which will be published in October. There are no handsome vampires or shirtless werewolves in the teen story, but it does have an interesting heroine. It follows the global adventures of photojournalist Clea Raymond, whose gifted photography skills prevent tragedies before they occur.

Her next one is a nonfiction book about kids coping with divorce. Her parents are divorced and she will reportedly use her own personal experiences for the book, which is scheduled for release in 2012. Fans will remember that Hilary has written about her own parents’ separation in the songs “Stranger” and “Gypsy Woman.”

Would you purchase her books?

I mean the only way you can be it is if you know how to strut and she is definitely strutting it right now. I'm not even going to bother going into detail of what it is because then that would require a whole new expectation of things and we would just feel like we are getting no where with this whole description. I'm sure you understand my reasoning with this as you always do because you just so happen to be that type of understanding person.

Remember when Hilary Duff was really really hot though? It was around the time when she still wasn't 18 and I'm not saying that to be a perv, but have you see anyone, besides Lindsay Lohan, intentionally unhot themselves before they reached 30? Yeah, I'm being dead serious when I say unhot because that is the only explanation for what has been done here.

I can't explain it quite specifically when looking at these pics, but she doesn't have...wait...dammit...she doesn't have it anymore. After I just claimed she is it, now I am saying she doesn't have it anymore. I can't seem to make up my mind. This is certainly a problem that needs some correcting.

I'm going to have to hit the drawing board all over again to get this one sorted out so stay tuned later.

She hasn’t been featured on any magazine covers for a while, so it’s nice to see Hilary Duff as Nylon magazine’s first cover girl of the year.

Photo from Just Jared

The 22-year-old talks about her clothing line, Femme for DKNYJeans, her “rad” mom, and her role as Olivia Burke on Gossip Girl. “I was a little hesitant,” she said about her GG character. “It was kind of close to home… then I realized, I would never say something [that Olivia says].”

Notice that she’s looking a bit curvier—a refreshing change from her extreme weight loss the past few years.

It seems like ages ago since I heard (or read) Hilary Duff’s name but this comeback to TV is a big one. She is due to guest star on Ghost Whisperer, of which Jennifer Love Hewitt is the star.

Duff released the video on her MySpace page and you get to see her doing some very “bad girl” moves. Check it out.

Loving Hillary Duff’s new body? Here are tips on looking fab and fit — even without a celebrity trainer.

On her “Dignity” tour’s Mexico stop, former teen queen Hilary Duff was accused of lip-synching, reminiscent of the plot in her former film, The Lizzie McGuire Movie, where her greasy Italian love interest was indeed doing the dirty deed.

Miss Duff vehemently denied the allegations, blaming faulty Mexican equipment. Her people stand behind the star, insisting that she always performs live in her concerts.

Hilary Duff send the paparazzi a very nasty look as she & her NY Islanders hockey pal Mike Comrie pull into the West Hollywood hot spot Area.  But if you’re going to visit hot spots, Hil, you have to expect that they’d be there, right?…

The duo were seen arriving at the nightclub after a long dinner with Duff’s sister Haylie at a restaurant in Brentwood.  I think this Comrie dude could be good for the Hilary.  What do you think?

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Us Weekly has debuted a new annual swimsuit issue, and guess who’s gracing the cover?  None other than Hilary Duff!

If I were to think back a few years ago, I would have never said Hilary would be gracing the cover of anything in  a bikini, except maybe Fattie Weekly.

But Hilary seems to have taken her weight very seriously since she read reports of her sporting a little more weight than she needed to a few years back.  The singer/actress went down from  

“It made me obsessed,” Hil said of her sctrict diet.

“I would beat myself up if I had some fat.”

But when the 5-foot-2 singer/actress went down from 130 to 100 pounds in 2005, sister Haylie stepped in & finally intervened.

“She said, ‘Why are you being so strict with yourself?’It was like an awakening,” revealed Duff.

“I don’t want to be so skinny that people are like, Oh my god, she’s lost a lot of weight.”

As of right now Hilary is very pleased at staying around 109 pounds, saying, ”As you get older, you just get more comfortable in your own skin.”

Congrats to Hilary for finding a good medium balance in there, she looks great!

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“I definitely don’t just buy what I want. When you get to that point, then you’re never excited about anything? If I splurge on a bag I still get so excited about it and like, talk about it all the time. I like feeling like that.

~Hilary Duff after being asked whether she just buys what she wants. 

“Being in the public eye, it is really hard.”

“Everyone is constantly criticizing you and picking you apart. You see these magazines and people are enjoying themselves on the beach, and people are zooming in on their cellulite. They notice everything about their body. It is mean and it is hard to stay sane.”

~Hilary Duff on posing in bikini for Shape magazine

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Monday on MTV’s TRL, Blades of Glory stars Will Ferrell & Jon Heder took a stab at trying to teach unsteady Hilary Duff to ice skate.

Ferrell & Heder were doing the rounds in New York to promote their new movie, while Duff was trying her hand at cohosting the popular MTV show.

I’d have to say that after seeing the show, Duff may not be the next Kristi Yamaguchi, if you know what I mean!

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