How to change the fontsize of the \part command

I am using the report style and I would just like to change the fontsize of the \part command. How do I do it ?

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Here's another option, using the sectsty package (instead of \large, use the font size that best suit your needs):

\documentclass{report}
\usepackage{sectsty}

\partfont{\large}

\begin{document}

\part*{A test unnumbered part}
\part{A test numbered part}

\end{document}
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You can patch the relevant command by the »etoolbox« package. The \@part macro is responsible for the formatting of the part prefix and the heading itself. It contains two commands that determine the font sizes. Hence you have to patch it two times.

\documentclass[11pt]{report}
\usepackage{etoolbox}

\makeatletter