This draw can be followed and watched live on UEFA.com's draw center. You can also find out your local TV channel showing the draw here. Make sure you tune in close to 12:00 CET in order to find the official stream available, though the draw itself should start a bit later, as fan-favorite Gianni Infantino needs to explain all the rules for those who aren't regulars.
Keep in mind that Los Blancos can play against either Juventus, Leverkusen, Arsenal, Manchester City, Paris Saint-Germain, Schalke or Shakhtar, so it might not be that easy of a draw, especially if Manchester City or PSG end up visiting the Bernabéu.