FIG. 1 is a perspective view taken from the top, front and left side of a bathtub shower curtain leak arrestor showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The fragmentary broken line representation of a bathroom, a bathtub, a shower spray head, a shower curtain rod and a shower curtain in FIG. 1 is for purposes of illustration only and forms no part of the claimed design.