I know that just because they presented an award together doesn't mean that they are a couple, but there are a lot of things all over the internet citing that they are. Does anyone know if this is true? if so I'm so happy, because they make a beautiful couple!

No!
Jake was with Reese Witherspoon, but they split, so currently Jake is single and not in a relationship.

Apparently yes. Congratulations-Well cute Rachel is an improvement from below average looking Reese Witherspoon
whosdatedwho.com/celebrities/…

Are Jake Gyllenhaal and Rachel McAdams a couple?