Kate Middleton having her engagement ring resized

Kate Middleton shakes hands with well-wishers following a visit with Prince William to Darwen Aldridge Community Academy on April 11, 2011, in Darwen, northwest England.
Alastair Grant - WPA Pool/Getty Images
Kate Middleton shakes hands with well-wishers following a visit with Prince William to Darwen Aldridge Community Academy on April 11, 2011, in Darwen, northwest England.
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(CBS) Kate Middleton is reportedly having her famous engagement ring resized to fit her finger better.

The royal bride-to-be asked royal jewelers G Collins and Sons to fit two platinum beads, called "speed bumps," inside the band, according to British tabloid The Sun.

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The paper reports that Middleton, who appears to have slimmed down as her wedding day approaches, was afraid the ring would fall off.

A source told The Sun, "The band was turning. Kate absolutely adores it and didn't want to cause a fuss."

"A bride's worst nightmare is looking down and seeing her ring has fallen off," the source added. "One can only imagine how this is magnified when you are marrying the future King of England."

The diamond-and-sapphire ring was Princess Diana's engagement ring. Prince William, 28, gave it to Middleton, 29, when he proposed. Their engagement was announced last November.