Sydney Sweeney went from boxer to Barbie for the red carpet premiere of "Christy" ... and we have pics!
Check 'em out ... the actress stepped out in a pale pink, sheer lace number with a flowy skirt and sequin-embellished neckline in London Town Friday.
Despite playing extremely tough fighter Christy Martin in the movie, Sydney was a total softie at the premiere ... snuggling up to fans for selfies. Inside, Syd graciously shared the stage with her collaborators in front of the BFI London Film Festival crowd.