21 Savage is a living, breathing example of that ol' saying, "fake it til you make it" ... at least according to ICE. An ICE official told CNN on Sunday ... "His whole public persona is false. He actually came to the U.S. from the U.K. as a teen and overstayed his visa." Also, Jussie Smollett stood tall Saturday night as he made his first public appearance since Tuesday's attack, telling hundreds of fans, "I had to be here tonight. I couldn't let these motherf*****s win."