Singer-songwriter Alexa Ray Joel reveals another side of herself on “Riverside Way” — a sultry new single and video that upends what she calls her “good girl” persona — and, in an interview with Newsday, also reveals that her dad, Billy Joel, is "doing great" since announcing h i s diagnosis with a brain disorder in May.

“I'm very supportive and close with my parents,” Alexa Ray Joel, 39, said, referring to her rock icon father and supermodel Christie Brinkley . “People see me as the good daughter, which is great. But I wanted to also assert: OK, well, I'm a woman unto myself, too, with my own imagination and fantasies and desires.”

“Riverside Way,” scheduled for official release Friday, is a bass-driven, R&B-tinged track that finds a breathy Joel singing such suggestive lines as

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