Standing from Prone

[Veldrin Shadowbane]

When using a move action to get up from prone, do you suffer the -4 ac when you provoke the attack of opportunity? Heated debate going on right now, need help! lol!

[Dasrak]

Attacks of opportunity resolve before the action that provoked them, so you're still prone when the attack resolves.

[Nefreet]

Yes, you are still at -4.

It also means you can't be tripped, because you're already prone.

[Raymond Lambert]

I concur with Nefreet.

[Komoda]

There is a debate about if you can be tripped or not.

There is no debate that BEING TRIPPED AGAIN DOES NOT STOP YOU FROM STANDING UP.

It all has to do with rider effects on trip attacks.

Search if you are interested.

But to the original question, you are still at -4 until you complete standing up. The AoO happens before you stand up.