Hollywood Legend Frankie Avalon -- The Beatles Would Be Huge ... In Any Era!

Would The Beatles have been just as popular had they hit the charts today? You better believe it ... so says Hollywood legend Frankie Avalon.

Our cameraman posed the question to the '60s teen idol recently ... needless to say, Frankie's answer was a resounding YES ... telling TMZ, "I think if The Beatles debuted in ANY day, they'd be humongous. It was a great act, great songs, great music."

As to whether the band could've adapted to modern audiences, Frankie continued, "Look, great is great ... and they were great. I don't care what time, what year, whatever ... they were just wonderful."