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"I'm always trying to impress my girl," the musician tells PEOPLE at a performance at the Griffith Observatory in Los Angeles Monday to benefit Green Dot Public Schools. "It doesn't make me nervous, it usually makes me better. It kinda makes me tighten up a little bit, to tell you the truth."
Even though Heigl missed the most recent performance, she still catches her husband's shows when she can. "She used to tour more with me then she does now, [but] she's working some pretty heavy hours."
Despite their hectic schedules – Kelley is promoting his new album To Remember and Heigl is busy shooting Grey's Anatomy – the newlyweds still put each other first.
"Our relationship is very important to both of us," says Kelley.
Still, Kelley would like one more woman in his life. "I'd love to do a duet with Norah Jones," he says.
"I think it would sound amazing. We'll have to see, maybe if you stick that out there it could happen quicker."
JOSH & FERGIE: ROCKED BY SCANDAL
Did he cheat with a stripper?
Married less than a year, the couple denies an Atlanta woman’s claims that she and Josh had a fling
Note that this week’s cover of PEOPLE may differ regionally
