Sarsgaard and Miller's late-night karaoke sessions

Sienna Miller and Peter Sarsgaard became karaoke buddies while shooting new film Mysteries Of Pittsburgh.

Night shoots in Pennsylvania often left the cast and crew awake in between takes at very unsocial hours, but they found a local bar where they could sing to each other.

Miller says, "A lot of this film was night shoots so we did karaoke. My signature song was These Boots Are Made For Walking."

Sarsgaard adds, "I did Behind Blue Eyes because it sounded very right for (character) Cleveland. Thats (karaoke) always good for chemistry."

The fun nights also helped take Sarsgaard's mind off the fact he was about to become a first-time father - his fiancee, Maggie Gyllenhaal, was close to giving birth as he shot the film in Pennsylvania.

He tells WENN, "My 'wife' was about to have a baby and I was flying back every 10 minutes on a Seneca airplane and Im a bad flyer."

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