Wiz Khalifa Diaper Bag Duty In Beverly Hills

7/2/2013 5:30 AM PDT

Wiz Khalifa -- Diaper Bag Duty in Bev Hills

With a diaper bag slung over his shoulder, new daddy Wiz Khalifa was prepared in Bev Hills yesterday in case he had to deal with any of that brown & yellow, brown & yellow, brown & yellow.

( ... and that was our TMZ "Terrible Joke of the Day!")

Wiz and his fiancee Amber Rose took their 4-month old son Sebastian 'The Bash' Taylor Thomaz on a family walk in the 90210 yesterday.

Unclear where they were going, but one thing's for sure ... that was a TERRIBLE joke!