Selfie apprentice ... meet selfie master.
Tennessee Titans quarterback -- and admitted selfie-aholic -- Zach Mettenberger came face-to-face with his social media mentor Paris Hilton last night at the famous Palm Steakhouse in Beverly Hills.
Of course, Mettenberger caught all sorts of heat this season when he took a locker room selfie before playing the Houston Texans ... and JJ Watt famously mocked him on the field for it.
Mettenberger even joked afterward that he checked himself into "selfie rehab" following the game ... because he had gotten "addicted" to posting the solo shots to social media.
Seems to have worked ... Zach essentially abandoned his social media accounts a few months ago.
As for Paris, don't worry ... she posted the pic of the two of 'em on her Instagram.