So we love when we get the deets on celebrity beauty secrets, but this one came as a surprise. We usually expect to learn about favorite lipstick shades, but now we know not to count supplements out of the secretive mix.

We recently shared the gorgeous shots of singer/actress Christina Milian rocking an elegant pompadour updo on the red carpet at the 2013 Alma Awards. Her hair was perfectly coiffed by her longtime stylist Randy Stodghill. Now we all know Christina has naturally luscious locks, but many women aren't so lucky, including other Hollywood starlets.

Randy knows the problem of thin, weak hair all too well. "I have a lot of clients that complain about thin, dry, unhealthy and dull hair," Randy confesses.  "The first thing I always ask them is what are you doing? They always admit to something unhealthy. People forget hair is alive. If you keep your body healthy and feed it what it needs to function, your hair is bound to grow and flourish too."

Well it looks like actress Reese Witherspoon has taken this advice to heart. We hear the A-list starlet is as equally a big fan of hair growth supplement Viviscal, as this popular hairstylist is.  "I always recommend my clients start taking Viviscal because it makes a big difference," Stodghill said.

Just what is Viviscal? Available as a supplement pill as well as a shampoo and conditioner, this brand uses a drug-free formula to nourish thinning hair and promote healthy hair from the inside. The pill promises to double your hair follicle growth, reduce shedding and boost hair's texture and strength in just six months!

Once an industry secret of Tinseltown, the secret to hair growth is now out, suitable for anyone to use. Men and women over the age of 18, of all races and all hair types, can experience Viviscal and see results.

"When I'm working on a movie, they blow-dry and curl my hair quite a bit," Reese explained. "I takes these supplements to keep it healthy." Other celebs vouch for Witherspoon's love for these hair growth pills as well. Additional brand fans include actress Kate Hudson, Selma Blair, and most recently, the buzz-cutting Miley Cyrus.

After going super short with a blonde crop top hairstyle, Miley admits she misses her longer tresses. "I'm secretly tugging on it every night and taking Viviscal," she told Kelly Osbourne of E!'s Fashion Police.

Like Reese, Randy is also a huge fan of this hair care supplement. "The hair grows faster and gives more oomph, while leaving a healthy shine and soft finish. You end up having more volume because it is thicker and gives an all-around healthier appearance," he explained.

Priced as low as $39.99 a month, check out the brand and the many testimonials on their website here. Who knew longer hair was just a pill away. Have you tried Viviscal? Let us know with a note below.