Newlyweds Pete Wentz and Ashlee Simpson have announced a new addition to their family. The Fall Out Boy rocker has posted their new 10-week-old puppy on his website.

Wentz writes:

Pete Wentz has hinted he and wife Ashlee Simpson are expecting twins.

The Fall Out Boy rocker accidentally let the news slip during an interview on a radio show when he referred to his unborn baby as "them."

Pete Wentz "hates" his birthday.

The Fall Out Boy rocker, who turned 29 yesterday, dreads his special day because getting presents makes him nervous.

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.

Pete Wentz loves being married to Ashlee Simpson because he can hang out with his new wife every day.

The Fall Out Boy rocker - who tied the knot with singer Ashlee in a secret ceremony last month - has opened up about the reasons he enjoys married life.