Ashlee Simpson And Pete Wentz's Little Party Boy

Ashlee Simpson and Pete Wentz were all smiles when they left a party at a friend's house in Los Angeles on Sunday (August 29). Their 1 1/2-year-old son Bronx was also there for the festivities.

The rocker dad is enamored with his little guy. He recently said: "Every time I see my son, it looks like he's landing on the moon and discovering new rocks and stuff.

"I mean, every time he looks at his hand, it's like he's Christopher Columbus making it across the ocean. It's pretty awesome."