Ariana Grande -- Sacre Bleu! Crazed Fans Mob Star In Paris

The French love to eat ... they nearly swallowed Ariana Grande whole today as she arrived at her hotel in Paris ... and TMZ has video of the frenzied mob of fans that greeted her.

The young Nickelodeon star is in Europe promoting her album, "Yours Truly" ... but it's clear from the video even she didn't expect this kind of craziness.

The 20-year-old "Sam & Cat" star knows how to work a crowd, though ... because after she was safely inside the hotel lobby ... she walked back to the entrance with her camera ... sending fans into another fit of hysterics.

Ariana also announced her newest project today ... a collection of Christmas songs that she will release individually every week until the end of December.