Lenny Kravitz on the bizarreness of his "secret" ex-fiancée working with his daughter.

It’s one of the most unlikely celebrity pairings in recent Hollywood history: Aussie screen icon Nicole Kidman and rocker Lenny Kravitz.

In a relationship wedged between Kidman’s marriage to then-heart-throb Tom Cruise that ended in 2000 and her marriage to country crooner Keith Urban, it’s easy to forget that this unlikely pair once walked red carpets together more than 14 years ago.

Earlier this year, the 50-year-old Big Little Lies star revealed that she and Kravtiz were actually engaged.

The star made the confession to Net-A-Porter’s The Edit, sharing that she and co-star Zoë knew each other well before the HBO series began filming.

Listen: Why we are really excited to talk about Big Little Lies. (Post continues…)

“I knew Zoë because I was engaged to her father,” she revealed. “It’s all in the family! I love Lenny; he’s a great guy.”

Nicole has spoken about her secret engagement before – but never named who the romance was with until this year.

“It just wasn’t right,” she told Vanity Fair in 2007, speaking of why the engagement came to an end.

"I wasn't ready. We weren't ready."

Now, it's Lenny's turn to open on the relationship, telling Mr Porter the star was "amazing".

"I have stayed friends with my exes, in most cases," he said.

He and Nicole stayed so close that he said he was "excited" by the prospect of his ex and his 29-year-old daughter reunited on the Big Little Lies set.

"Zoë and she hadn't spent time together since she was younger, since Nicole and I were together, so that was great," he said.

Zoë said that the trio lived together at the time Kidman and her father were dating.

"I hadn't seen her in a long time before Big Little Lies, but there was a point where we were all kind of living together," she said.

"I was about 13, and she would take me to see movies; she was so nice to me."

Although the pair didn't share a huge amount of screen time in the series, the chemistry between the cast was clear: the show and its cast has been nominated for a number of Golden Globe awards, including Best Actress, Best Supporting Actress and Limited Series or Motion Picture Made for Television.

For more TV and entertainment news, listen to the latest episode of The Binge: