Jennifer Aniston, Gwyneth Paltrow and Kate Middleton are all known for their luscious blown-out locks that add an extra touch of glamour to their looks.

And now we know that the secret to achieving their beautiful hair is all in the heat. Salon's such as New York's Drybar are dedicated to making hair sexy and silky smooth.

The "blow-out" has become such a phenomenon that Arielle Confino and Kristin Breen are self-proclaimed "blow-out junkies."

"Drybar has become an integral part of my life," Confino told ABC News' Amy Robach.

Breen spends nearly $6,000 a year on her frequent blow-outs. That's more than the average vacation for a family of four.

"I'm definitely obsessed," Breen said.

"A Drybar junkie?" Robach asked.

"Yes, exactly," Breen replied.

And they're not the only ones. From New York to Los Angeles, thousands of women across the country are lining up at blow-out salons, from Drybar to Blo to Blow Bar, all to give their tresses the star treatment.

"If you sit in Drybar for a couple of hours, you see all these women walk out. You'll be like, 'I want what she's having," Alli Webb, Drybar's founder, told Robach.

A visit to a blow-out bar usually takes about 40 minutes. And it truly is a bar for hair, complete with a menu of hairdos with names such as the "cosmo" and the "straight up." You can even get an actual glass of champagne while you wait.

But Jennifer Goldstein, Prevention magazine's beauty director, warns that all the excess heat on your hair can be harmful.

"It is heat, so it can damage hair. So you might want to limit it to about three a week," Goldstein said today on "Good Morning America."

And if you're trying to obtain the look at home, Goldstein recommends using a professional dryer with a wattage of at least 1875 to achieve the desired super-sleek finish.