The Partay is over!

At the insistence of PETA, Reese Witherspoon has promised never to carry her $3,820 Chloe "Partay" python bag again.

The Oscar winner ditched the snakeskin purse after PETA noticed her toting it around LA and immediately sent her a video -- narrated by Walk the Line costar Joaquin Phoenix -- that detailed cruel practices used on animals for the sake of fashion.

After Witherspoon vowed to give up the bag, PETA said in a statement:

    "We've long known Reese to be a kind person, so we're pleased -- and not surprised -- that she is hanging up her python bag for good. We hope Reese's honest mistake will serve as a reminder for all of us to be extra-certain that what we’re buying is mock croc or fake snake."

The Chloe bag isn't exactly legal either -- California outlawed the sale of snakeskin in 1970.