Wiz Khalifa -- Amber Rose Is Trying To Crash My Vegas Party

Wiz Khalifa just wanted to get turnt up in Vegas for this Memorial Day weekend but there's a big wrinkle ... baby mama Amber Rose.

We’re told Wiz just found out his estranged wife has booked a suite at the Palms Casino Resort, the same place he's staying. He's contacted the hotel and insisted that he's not on her floor. Wiz has made it clear ... he does not want Amber in his line of sight during the long weekend.

It's gonna be complicated, because Amber's hosting a pool party the same day Wiz debuts at club Rain as DJ Daddy Kat.

Here's what's apparent ... bad blood in Vegas won't stay in Vegas.