The Safe Haven actor, 44, and the tot faced off to the beat of an instrumental song. Showing off his moves, the Transformers star did a few jumping jacks before hitting the floor for a head spin! Axl tried to follow his dad’s trick, and Duhamel hilariously helped him out by pushing him around in circles on the florescent-colored dance floor.
“I can’t think of a better way to celebrate a 4th birthday,” the former fashion model captioned the clip posted to Instagram. “Happy Birthday Axlito!”
Fergie also took to the social media site to post a series of pictures with the tyke. “Happy 4th bday Axl Jack!!! I love you – mommy,” the “Big Girls Don’t Cry” songstress, 42, wrote alongside a selfie with her son.
“#Doubletrouble,” the former Black Eyed Peas member said of another adorable photo of herself with Axl, who were both sporting plastic crowns. “Happy 4th bday #axljack.”
Two nights before Fergie gave birth, Duhamel appeared on The Tonight Show to dish on his last-minute jitters. “You know, I gotta tell you, I’m a little bit nervous,” he told late-night host Jay Leno. “I thought that I was going to be good. Thought I was ready for this and I’m a little bit terrified. I’m excited and terrified, because I am responsible for this little thing. Forever.”
For the latest celebrity entertainment, news and lifestyle videos, subscribe to Us Weekly’s YouTube Page.
Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!