Cher was serving full-on disco diva vibes ... tearing up Studio 54 like it was still the '70s!

The 79-year-old icon had her boyfriend Alexander "AE" Edwards in tow ... the duo serving peak power-couple energy at the legendary NYC hotspot, soaking up the neon glow over the weekend. TMZ.com

In the clip, Cher’s basically aging in reverse -- clinging to her man while dancing the night away. TMZ.com

With those disco-era looks flashing back to her heyday, the whole night was a pop culture time machine! Getty

And yep ... she took her toyboy beau right back in time with her!

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