Instagram / @sydneysweeney

Sydney Sweeney 's taking one last lap around the ring ... sharing a ton of pics from behind the scenes of "Christy" and thanking everyone involved. Instagram / @sydneysweeney

The actress dropped the pics the day after the film's wide-release in theaters ... with one featuring standing in the ring toe to toe with the film's namesake, Christy Martin .

The two are wearing complimentary outfits -- Christy does love her pink, after all -- and, they're grinning ear-to-ear.

Another pic captures Sydney in a pink tracksuit leaning against her matching BMW ... a bright pink number which will get quite a few dudes wolf-whistling when they see it. Instagram / @sydneysweeney

And, it wouldn't be a boxing flick without a spot of fake blood ... and this pic show

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