Looking on the internet deeply has found these results:

let you know is the most popular phrase on the web.

letting you now 11,760,000 results on the web	let you know 192,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I'm just letting you know now, so you don't come kicking in my homeroom door once trouble starts. I'm letting you know right now, that chick is a stickler for I.D.'s. Now letting you climb all over me this morning Was totally worth it. I'm just letting you know now, I'm not taking care of him when you guys die. I'll send you in my little one, but we can't risk letting anyone seeing you now, can we? I have cheered the uncheerable, Norman, and I'm not letting you give up now! I'm letting you know right now, that chick is a stickler for I.D.'s. There's no way we're letting you go now!	To let you know how things are going. Just thought I should let you know So I wanted to let you know that we lost Ed Truck. To let you know that I've decided to keep the baby. Just wanted to call and let you know... Just calling to let you know... Delete. Then I guess I should let you know of curtis lemansky. I wanted to let you know that we've decided to go public.

letting you now

11,760,000 results on the web

let you know

192,000,000 results on the web

More popular!

I'm just letting you know now, so you don't come kicking in my homeroom door once trouble starts.
I'm letting you know right now, that chick is a stickler for I.D.'s.
Now letting you climb all over me this morning Was totally worth it.
I'm just letting you know now, I'm not taking care of him when you guys die.
I'll send you in my little one, but we can't risk letting anyone seeing you now, can we?
I have cheered the uncheerable, Norman, and I'm not letting you give up now!
I'm letting you know right now, that chick is a stickler for I.D.'s.
There's no way we're letting you go now!