Kidman dated the singer from 2003 to 2004, two years after the end of her marriage to actor Tom Cruise. Still, Kravitz admitted to finding it intimidating to working with an experienced actress like Nicole Kidman.
Gracing the cover of the fashion publication, the Oscar victor explained she had no problems working with Zoë Kravitz - the daughter of her ex and Lisa Bonet - for her HBO miniseries due to the fact that she's still very close with the actress' dad.
"It just wasn't right", she told Vanity Fair in 2007 of the secret engagement, without revealing her former fiancé. However, Kidman insisted, "I didn't really want a relationship".
"He's a great guy", Kidman said.
A report from People explains that Nic and Lenny met when she rented his Manhattan apartment in the summer of 2003. "I wasn't ready. We weren't ready", she told the publication.
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"[Nicole] can be quiet and shy, which is interesting because the beast of an actress that she is, is so loud and clear", Zoe Kravitz said. She's so good that sometimes it was distracting.
And as for Zoë Kravitz's opinion of her could-have-been step-mom?
Speaking to Net-A-Porter's The Edit about her connection to Lenny, Nicole - who has been married to Keith Urban since 2006 - said: "Well, I knew Zoé because I was engaged to her father".
He added, "I'm just saying, imagine that you've never met anybody like that, that's where I was at".
In fact, the former flames have remained friends after all these years, even posing together (with Nicole's country-singing husband) at the 2013 CMT Music Awards.