Ace Knute Johnson seemed to be saying "hello world!" with the comical expression the baby boy struck while being carried in his father's arms Friday.

Except for a couple of Twitter snaps, Jessica Simpson and Eric Johnson's  five-month old son has been mostly kept undercover by his parents until now.

That changed on Friday when former NFL  player Johnson carried Ace and shared a smile with fans who oohed and aahed at his adorable son as they departed Los Angeles International Airport.