Elon Musk is proud of his girl!
Though the two have yet to publicly confirm their romance, the tech billionaire took to Instagram on Thursday to share a pic of Heard in character as Mera from the upcoming movie, Aquaman.
WATCH: Amber Heard and Elon Musk Hold Hands on First Public Outing -- See the Pic!
"@AmberHeard as Queen of Atlantis," Musk wrote alongside the photo, which was first posted by director James Wan.
EXCLUSIVE: Amber Heard Confirms Her 'Aquaman' Role in 'Justice League', Dishes on 'Interesting' Mera Costume
A source told ET last month that Musk and Heard had been dating for "a while" after meeting "a few years back while Amber was with Johnny [Depp] and [they] were strictly friends."
"Elon is very attentive to Amber, which is something she looks for in a partner," the source said.
See more in the video below.