There was a big confrontation at Nicki Minaj's house in Hollywood moments ago ... and it got so bad the cops came ... TMZ has learned.

Here's the backstory. Law enforcement tells us, a couple of weeks ago, Nicki's maid took a photo of the singer out of the trash and then asked Nicki to sign it. Nicki got pissed and fired her.

Cops tell us, the maid did come back today, and Nicki became enraged and ordered her to leave. A source privy to the fight tells TMZ, the maid stood her ground, demanding not to be "treated like an animal" -- at which point, Nicki allegedly said, "I'll show you how to treat someone like an animal ... get the f**k out of my house!"

Now here's where the stories are a bit conflicting. One source says -- contrary to what the cops say --  Nicki actually made a mistake, saw another maid and assumed she was the one Nicki had fired.

We have had multiple people involved in the incident tell us ... the maid Nicki confronted was NOT the same maid she fired a few weeks ago. It was a case of mistaken identity.

Either way, Nicki's boyfriend got in the act and began pushing the maid with his body. The maid's boss called the cops and filed a battery report.

The cops came and the maid asked to make a citizen's arrest, but eventually decided against it so no one was taken into custody.

Dallas police have released the 911 tape from the Nicki Minaj hotel fight last month -- in which you can hear a woman, referred to as "Nicki," scream ... "Look at what he did to my face!" 

As TMZ first reported, cops responded to the Palomar Hotel on July 12th -- after Nicki complained that some guy she knew hit her in the face with a suitcase.

According to the police report, obtained by TMZ, Nicki refused to press charges after paramedics arrived.

TMZ has obtained the police report describing the hotel altercation between Nicki Minaj and a man, in which she claimed he struck her in the face with a suitcase ... and Dallas cops tell us the alleged attacker is Nicki's assistant Safaree Samuels.



TMZ broke the story ... Nicki and Samuels were arguing at a hotel pool in Dallas Monday night and took it upstairs to the room.

According to the police report, Nicki followed Samuels up to the room they were sharing, to make sure he didn't take any of her stuff.  Nicki was in the room looking into her suitcase, which had some of Samuels' belongings, when she says he "grabbed the suitcase and as he was picking it up, he shoved the suitcase across [Nicki's] chin and lower lip."

The police report goes on:  "[Nicki's] teeth struck the inside of her lower lip, causing the inside of the lower lip to cut and start to bleed."

According to the report, a paramedic arrived on scene, but Nicki decided she didn't want to press charges so the case was closed.

Rapper Nicki Minaj told authorities she was "struck" in the lower lip by a man ... during a heated argument at a swanky Dallas, TX hotel last night ... law enforcement sources tell TMZ.



TMZ has learned ... Minaj was hanging out at the pool at the fancy Palomar Hotel when she got into a very intense verbal spat with an unidentified man she was staying with.

Nicki told a hotel employee to call police ... while the man went to their hotel room. Nicki followed soon after.

When cops and paramedics arrived, Nicki told authorities their poolside fight continued inside of their room ... and the man hit her in her lower lip.

The man had already left the scene when cops arrived ... but Nicki insisted she did NOT want to press charges.  Nicki also claimed she was NOT in a relationship with the alleged attacker.

Cops tell us an incident report was taken ... but no charges will be filed per Nicki's request. 

Calls to Nicki's rep have not been returned.