The ornamental design for an inflatablephotobooth, as shown and described.
FIG. 1 is a top, rear and right side perspective view of an inflatable photo booth showing my new design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a top plan view thereof.
The broken lines portions of a photo booth representing the contour of inner wall structures are shown for illustrative purposes only and form no part of the claimed design.