Let's welcome the weekend with everyone's favorite food -- pizza! If you're a pop star like Katy Perry, the boys of One Direction or Justin Timberlake, there is something irresistible about the combination of bread, sauce and cheese. The origin of pizza is hazy, but it is said the ancient Greeks and Egyptians ate it. Whoever it was, we want to go back in time and kiss them on the mouth.

Who doesn't love pizza? It's a great unifying factor. You could mend broken diplomatic relationships with a good pie. Trust us.

So, let's celebrate our Pizza Party the absolute best way... GIFs!

Lady Gaga, get this Pizza Party started!

Britney Spears shows off her impeccable culinary taste at a young age.

The luckiest pizza slice in all the land...

When someone told Justin Timberlake all the pizza was gone.

Katy Perry knows the importance of a well-rounded diet, which of course includes pizza.

Seriously, Katy loves her pizza.

'Glee' star Lea Michele doesn't like to cry or sing on an empty stomach.

Don't like pizza? Louis Tomlinson ain't got time fa that!

Rare footage of a deleted scene from Michael Jackson's classic music video, 'Thriller.'

Don't look so sad, Zayn. We'll have another pizza party again soon!