Marc Anthony first performed " I Need to Know " live on '' Good Morning America '' on July 23 , 1999 . He also performed the songtogether with " That 's Okay " on '' Saturday Night Live '' . He also sang it at the 42nd Annual Grammy Awards show ; Tom Moon , editor of '' The Philadelphia Inquirer '' , called his performance a " sedate reading " . In 2009 , Anthony performed " I need to Know " during the " Fiesta Latina " event at the South Lawn in Washington , D.C. Chris Richards of '' The Washington Post '' said that the audience , which was " flat-footed " during Anthony 's previous performances , " was now on its feet " . Anthony performed both " I Need to Know " and " Dímelo " on the promotion tour for the album , with the latter song serving as an encore . He performed the song at Madison Square Garden as an encore ; this performance was included on the video set '' The Concert from Madison Square Garden '' . The song was included on set lists for his Marc Anthony 2002 Tour , Nada Personal Tour , El Cantante Tour , Iconos World Tour , and the Vivir Mi Vida World Tour . " Dímelo " served as the main theme for the Colombian telenovela '' La Baby Sister '' . Anthony performed " I Need to Know " live at the 18th Annual Latin Grammy Awards in 2016 along with " Tu Amor Me Hace Bien " and " Vivir Mi Vida " where he was honored Person of the Year by the Latin Recording Academy
18th Annual Latin Grammy Awards
18th Annual Latin Grammy Awards
I Need to Know (Marc Anthony song)