Ashlee Simpson-Wentz is opening up about her new bundle of joy!

The new mom called motherhood a "fantastic experience," and posted this blog on her MySpace page Wednesday:

"Hey everyone! I haven't written in a while, just wanted to write and check in! Motherhood is the most fantastic experience I have ever been thru, Bronx makes me laugh and smile everyday! I finally left the house for Fall Out Boy's show on Monday night, which was so good. Their new songs sound awesome live, I can't wait for their new record! And last night I went to Pete and Bronx's godfather Travis' artshow. It's amazing to see how many artistic outlets those boys have! Made me very proud. It was an awesome show and so many of our friends and family came out to support. I hope you guys have a great holiday, I can't wait to spend it with my new family. Christmas tree goes up tomorrow!"

Ashlee and her husband, Fall Out Boy musician Pete Wentz, welcomed baby Bronx Mowgli Wentz on November 20.