We can’t believe how big Bronx is getting — and we love his rocker style!

Pete Wentz and an unidentified female, who is rumored to be his new girlfriend, took Bronx, 2, to a birthday party in Beverly Hills, CA on Friday, August 19. The rocker, 32, and Bronx‘s mom Ashlee Simpson split in February, but have been keeping it friendly for the sake of their son, who looks to be doing well!

Ashlee is reportedly dating Boardwalk Empire star Vincent Piazza while Pete has been living the single life — until now!

Bronx is definitely taking after his parents in the style-department — he’s a little punk rocker and we love it. (If you want his hi-top Converse for your little guy or gal, get the look here!)

–Leigh Blickley

Get more Pete and Ashlee:

1. Pete Wentz Breaks His Silence About His Ugly Custody Battle With Ashlee Simpson!
2. Ashlee Simpson Wants Sole Custody Of Bronx—Pete Wentz Will Fight It!
3. Ashlee Simpson & Pete Wentz, Experts Warn That How You Explain The Divorce To Son, Bronx, Now Will Determine His Mental Health Later