  Let G be a finite group and let Irr(G) be the set of all irreducible complex
characters of G. Let cd(G) be the set of all character degrees of G and denote
by \rho(G) the set of primes which divide some character degrees of G. The
prime graph \Delta(G) associated to G is a graph whose vertex set is \rho(G)
and there is an edge between two distinct primes p and q if and only if the
product pq divides some character degree of G. In this paper, we show that the
prime graph \Delta(G) of a finite group G is 3-regular if and only if it is a
complete graph with four vertices.
