  A description of the light curves of microlensed Type Ia supernovae (SNe Ia)
as extended and expanding sources is presented. We give examples of what
microlensing by stellar-mass Chang-Refsdal lenses can do to a small percentage
of supernova light curves. We find that in addition to overall brightening,
significant changes in light--curve shapes can also occur. Peaks can be
distorted, plateaus can appear, and even secondary peaks can be formed. The
effects of both the relative motion of the lens and the supernova and the
expansion of the supernova are given and compared. The effects of relative
motion are more pronounced when a distant supernova ($z_s \sim 1$) impacts well
within the Einstein ring of a nearby microlens ($z_d \sim 0.05$) and are less
important for more distant deflectors. We also find that the increase in shear
that comes with increased deflector distance tends to reduce the time
variability of microlensing. We briefly discuss the probability of observing
these effects.
