Elon Musk's son makes high-profile visit to the Oval Office. His mom, Grimes, isn't pleased The Oval Office generally maintains a rather formal air. But when Elon Musk's 4-year-old son, X Æ A-Xii (known as X), waltzed in on Feb. 11, he made himself right at home.

"I did not see this, thank u for alerting me. But I'm glad he was polite. Sigh," she responded to a fan on Twitter (also called X now) on Wednesday. "He should not be in public like this." Grimes dated the tech billionaire from 2018 to 2022: They share three children,

The singer said her 4-year-old "should not be in public like this" after the child joined Donald Trump for a press conference.