Elon Musk spent time with his 3-year-old son, X AE A-XII, at the Formula 1 Grand Prix in Austin, Texas, on Sunday.

The toddler was all smiles at the sporting event in a blue T-shirt, jeans and sneakers while riding on his dad’s shoulders and in a golf cart.

Musk, who shares the little one with ex-girlfriend Grimes, wore an all-black outfit to the Circuit of the Americas track.

“Elon arrived in the paddock more than an hour after the race began,” an eyewitness tells Page Six.

“He was smiling and laughing with a few friends before putting X on his shoulders and walking to the Mercedes garage.”

Our spy notes that Prince Harry watched the race in the same garage, but it is unclear whether the men sat together.

Elon Musk spent time with his 3-year-old son, X AE A-XII, at the Formula 1 Grand Prix in Austin, Texas, on Sunday.

The toddler was all smiles at the sporting event in a blue T-shirt, jeans and sneakers while riding on his dad’s shoulders and in a golf cart.

Musk, who shares the little one with ex-girlfriend Grimes, wore an all-black outfit to the Circuit of the Americas track.

“Elon arrived in the paddock more than an hour after the race began,” an eyewitness tells Page Six.

“He was smiling and laughing with a few friends before putting X on his shoulders and walking to the Mercedes garage.”

Our spy notes that Prince Harry watched the race in the same garage, but it is unclear whether the men sat together.

On Sept. 13, the 52-year-old entrepreneur filed a petition in Texas seeking to become the legal parent of their children.

Although her court documents were sealed, Insider reported earlier this month that she requested physical custody of the kids as well as a “standard restraining order” to keep her and Musk from moving the little ones out of the Golden State.

Musk’s filing, however, alleged that he has been a full-time Texas resident for at least “six consecutive months,” claiming to have lived in the same home as Grimes from May to July.

In an attempt to dismiss his “inappropriate” lawsuit over a location dispute, Grimes argued in an Oct. 6 filing that she “had and continues to have no continuing, systematic or minimum contacts with Texas.”