Whether you love thin crust or deep dish, do the New York fold or cut your pie with a knife and fork—(almost) every human being on the planet has a soft spot for pizza. And what's not to like? It's melted cheese on bread for Pete's sake! It's hard to believe that before WWII, pizza was almost selectively enjoyed by people in Italy and Italian immigrant communities.

Pizza as we know it was invented Southwestern Italy, Naples to be exact. Between 1900 and 1915, more than five million Italians fled Southern Italy to escape poverty and immigrated to America through Ellis Island. Many of these Italian immigrants settled in Northern cities and established "Little Italies," particularly in New York. These immigrants contributed to building bridges, railroads, subways, sewers and the first skyscrapers. Many of them also opened restaurants and markets that sold Italian cuisine. Italian Americans who owned pizzerias worked closely with shop owners, purchasing their native ingredients to replicate traditional Neapolitan pizza.

However, Italian culture and cuisine wasn't immediately accepted by American culture. Italian's were highly discriminated against in America during the first half of the 20th century and The Immigration Act of 1924 drastically cut down incoming Italian immigration from 42,000 to 4,000 per year. This caused Little Italies to shrink and many felt pressured to assimilate to American culture. Then WWII happened and Italian -Americans were encouraged by President Franklin D. Roosevelt to support the war. Hundreds of thousands of Italian-Americans fought in WWII and narrowly avoided internment camps after the war.

As they became more accepted, Italian-Americans developed their own flair and customs, even modifying the mother land's Neapolitan pizza. For example, pizzerias in New York City began selling flatter, crispier pies—whereas in Chicago they created the deep-dish style. Today, pizza is as much a part of American culture as it is Italian, particularly when it comes to fast food chains like Domino's, Little Caesars, Papa Johns and Pizza Hut.

In honor of National Pizza Day, which is honored every year on February 9th, we thought to celebrate in the way we do best—with gorgeous tattooed women of course! Both tattoo models, W33dhead and The Fit Pizza Girl, have sexy pizza-inspired ink and have been known to show it off from time to time. Take a look at some of their sexiest shots and enjoy a slice while you're at it.

W33dhead

The Fit Pizza Girl