Pete Wentz is "excited" about becoming a dad.

The Fall Out Boy rocker's new wife, singer Ashlee Simpson, is currently pregnant with the couple's first child and Pete says he is looking forward to them becoming parents.

He said: "I'm genuinely a nervous person in general. The first time I ever went to the doctor's office and heard the baby's heartbeat, I felt totally content and at peace with everything."

Last month, the couple revealed Ashlee's pregnancy following weeks of speculation. Despite previously denying the rumors, the couple wrote on Pete's website friendsorenemies.com: "While many have speculated about this, we wanted to wait until after the first trimester to officially confirm we are expecting our first child."

"This is truly the most joyous time in our lives and we are excited to share the happy news and start our family."

Pete - who turns 29 tomorrow - and 23-year-old Ashlee married in a secret ceremony on May 17 at her parents' home.

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