  Classical Cepheids are key probes of both stellar astrophysics and cosmology
as standard candles and pulsating variable stars. It is important to understand
Cepheids in unprecedented detail in preparation for upcoming GAIA, JWST and
extremely-large telescope observations. Cepheid eclipsing binary stars are
ideal tools for achieving this goal, however there are currently only three
known systems. One of those systems, OGLE-LMC-CEP1812, raises new questions
about the evolution of classical Cepheids because of an apparent age
discrepancy between the Cepheid and its red giant companion. We show that the
Cepheid component is actually the product of a stellar merger of two main
sequence stars that has since evolved across the Hertzsprung gap of the HR
diagram. This post-merger product appears younger than the companion, hence the
apparent age discrepancy is resolved. We discuss this idea and consequences for
understanding Cepheid evolution.
