Rapper Mellow Rackz has been accused of punching her boyfriend’s ex-girlfriend and then stealing her phone after getting into a heated spat in a Los Angeles hotel lobby, it was reported Friday.

The 22-year-old, who boasts more than 1 million followers on Instagram, allegedly unleashed after running into the woman early Monday, TMZ reported, citing law enforcement sources.

Rackz, who hasn’t been arrested over the saga, is said to have hit the ex repeatedly in the face, leaving red marks, the sources alleged.

She then allegedly swiped the ex-girlfriend’s cell after it dropped to the floor at some point during the scuffle, the sources claimed.

“What are you going to do about it?” the rapper allegedly said before fleeing to her hotel room, according to the outlet.

Cops responded but Rackz allegedly refused to come out of her room and insisted they speak with her lawyer instead.

A police report lists Rackz as a robbery suspect but the probe is still underway, the sources said.

The ordeal unfolded after Rackz’s boyfriend, who wasn’t identified, booked a room for the couple and a separate one for his ex-girlfriend in the same hotel, the sources added.