T​he richest man in the world was sporting a shiner during his farewell press conference with President Trump and admitted the culprit was his 5-year-old son.

​Elon Musk first acknowledged his bruised face when reporters asked​ about the caught-on-video incident of French President Emmanuel Macron being hit in the face by his wife.

“I got a little shiner here,” Mr. Musk said, laughing.

Later, when asked about his black eye, Mr. Musk quipped, “I wasn’t anywhere near France.”

Then he came clean.

“I was just horsing around with little X and I said, ’Go ahead, punch me in the face,’ and he did,” he said.

Mr. Musk’s son, X Æ A-12, who goes by X, has been a frequent companion with his father around the White House. He was spotted on top of his dad’s shoulders, in the Oval Office, and traveling on Air Force One.

• Mallory Wilson can be reached at mwilson@washingtontimes.com.