Director Sofia Coppola and partner Thomas Mars, the frontman for the band Phoenix, are expecting their second child, people.com has confirmed.

In a backstage interview with Chicago’s WXRT, the French-born musician, seemingly surprised, nodded affirmatively when asked about partner Coppola being pregnant

Coppola, 38, and Mars have been together for four years, and have a three-year-old daughter, Romy. Coppola was previously married to director Spike Jonze. “I heard the story that if you play Bach, babies in the womb get smarter,” Mars said.