UPDATE: ….and now we know who that person was. Mack Maine. And according to TMZ, he will be formerlly charged with assault and sexual battery:

Rapper Mack Maine WILL be charged with sexual battery and assault for allegedly groping a female and then punching her female friend on Lil Wayne’s tour bus last week … officials tell TMZ.

TMZ broke the story … Maine has been accused of inviting the alleged victims onto Wayne’s tour bus following a concert in OKC last week. While on the bus, one woman claims Maine stuck his hand down her shirt and squeezed her breast without consent.

The woman claims she slapped Maine and tried to get off the bus, along with her female friend … but Maine was so upset, he blocked the door and punched the friend in the face, breaking her jaw.

The D.A. tells TMZ it’s unclear WHEN they will file the charges against Maine, but officials say it’s just of matter of time.

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T.I. has already spoken about the incident, claiming that he knew nothing about it and that nobody of the sort came aboard his bus. From TMZ:

More drama for the Lil Wayne/2 Chainz/T.I. tour buses — law enforcement sources tell TMZ, a female fan says she was invited on board one of the vehicles after the show in OKC this week … and an entourage member punched her in the face, breaking her jaw.

The alleged attacker isn’t named in the police report — but the victim says her jaw was broken in two places … and the damage is so bad she required surgery to repair it, and her jaw is now wired shut for six weeks while it heals. The victim says she’ll be on a liquid diet for the entire time.

Here’s the story … the victim told police, the unidentified entourage member had been hitting on her during the concert … and invited her on board one of the rappers’ buses after the show.

The victim says she took the guy up on his offer — but when she showed up with her girlfriend, he stuck his hand down her shirt and grabbed her breast.

The victim says she slapped his hand away and he turned around and punched her in the jaw, sending her flying out of the bus door. She says she landed on her back on the pavement with blood pouring out of her mouth.

According to the police report, the entourage member ran off, and the victim was taken to the hospital.

A rep for the Oklahoma City PD tells TMZ, the incident is under investigation. So far, no arrests have been made.

FYI, the incident allegedly occurred just hours before police searched 2 Chainz’ tour bus for drugs … and arrested the rapper.