  Let $(R,\mathfrak{m})$ be a two-dimensional regular local ring with infinite
residue class field. Then the Rees algebra $\mathcal{R} (I)= \bigoplus_{n \ge
0}I^n$ of $I$ is an almost Gorenstein graded ring in the sense of
Goto-Takahashi-Taniguchi for every $\mathfrak{m}$-primary integrally closed
ideal $I$ in $R$.
