From TMZ:

It all went down at a fancy party inside a nail salon in Manhattan … when Erica Mena got into a heated discussion with a blonde lady named Tiffany.

Multiple people who were at the party tell us the two were squabbling over a man … and Tiffany implied that she had hooked up with Erica’s BF in the past.

We’re told Erica DECKED Tiffany … and all hell broke loose.

People rushed in to break up the girls … but both women made it clear — THEY WANTED TO FIGHT.

At one point, a man steps in to restrain Erica … and she threatens to slap him in the face unless he got out of her way. She even gives the dude a pretty nasty forearm to the body.

But just when she thinks she’s safe, Erica is BLINDSIDED by Tiffany … who somehow crept up from the side, and pounced on her prey like a ferocious ocelot (look it up, they’re awesome).

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