Desiree was an attractive neighbor of the Dunphy Family who was recently divorced - apparently, she had already slept with several male neighbors. In "The Bicycle Thief", Desiree encountered Phil, Claire and their son Luke Dunphy while out cycling, and they introduced themselves to each other. As she left, Phil commented to Claire that "she's awesome" but Claire disagreed.
Desiree later locked herself out of her new house just as Phil cycled by, and he helped her get back inside only for his bike to be gone when they returned to the sidewalk. Soon, she realized that a neighbor put the bike in her garage, and returned it to Phil. When she arrived at the Dunphy household, she told Phil that it was put in her garage while Phil was in her house. As Claire angrily turned to Phil, he replied "Classic me?"
Phil admitted attraction to Desiree.
She has not appeared again so far.