Jessica Simpson's Son Ace Turns 4! See the Sweet Birthday Snaps

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Happy Birthday, Ace Johnson!

Jessica Simpson and Eric Johnson's youngest child turned four on Friday, and in honor of his special day, the fashionista took to Instagram to share a few highlights from their fun-filled celebrations.

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Simpson recorded her son adorably singing "Happy Birthday" to himself in the car with help from his older sister, 5-year-old Maxwell.

"…and he is 4 ? ?♋️ ?," Simpson, 36, captioned the video. "#ACEKNUTE #carpoolkaraoke."

She also posted a pic of the birthday boy smiling big next to a gigantic cake and bright-colored balloons, captioning it, "May wish #4 come true my beautiful baby boy."

RELATED: Jessica Simpson Celebrates Daughter Maxwell's 5th Birthday With a Mermaid Party

The mother of two loves sharing pics of Ace on Instagram, marveling over his cuteness and strikingly good looks in each and every caption. See some of Ace's most memorable snapshots below:

Ace's birthday comes just a few days before another big family celebration -- Simpson and Johnson's wedding anniversary. The two are celebrating three years of marriage on July 5, and judging by the blond beauty's previous posts to her hubby, we're guessing she won't hold back on the love fest via social media.

Simpson, who met and got engaged to Johnson in 2010, couldn't stop gushing over the former NFL star on May 21, which marked their seven years as a couple.

WATCH: Jessica Simpson Shares Sweet Pic Celebrating 7-Year Anniversary With Eric Johnson

"7 years, 2 kids, and a whole lotta love later," the singer captioned a black-and-white pic of their precious family of four. "#may21 #MAXIDREW #ACEKNUTE."

Hear more in the video below!

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