Author Meg Cabot says it's "bittersweet" to end her Princess Diaries series. But she has more tween books on the way.

'Forever' yours on Tuesday

Meg Cabot tools around Key West on bicycles whose colors — pink, purple and turquoise — match the covers of her popular Princess Diaries series.
A new bike in a new color isn't in Cabot's future; her series about a reluctant teen royal is coming to an end. The last book, Volume X: Forever Princess (HarperTeen, $16.99), goes on sale Tuesday.

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