12:45 PM PT -- Bow Wow's been released on bond.

12:20 PM PT -- Here's the mug shot for Leslie Holden, who we've learned is Bow Wow's on-and-off GF, and goes by Kiyomi Leslie. She's also on "Growing Up Hip Hop" with the rapper.

She's facing the same battery charge as Bow Wow, and her bond's been set at $8k.

11:15 AM PT -- TMZ's obtained Bow Wow's mug shot, which shows big scratches on his forehead and a mark below his eye.

According to the Fulton County Sheriff's Office ... the rapper's been charged with Battery Substantial Physical Harm, which is in conflict with what we were told earlier -- that both sustained minor injuries.

Bow Wow's bond's been set at $8k.

Bow Wow was arrested in Atlanta early Saturday morning for allegedly beating a woman ... a woman who was also arrested for allegedly beating him.

ATL cops tell TMZ ... there was some sort of dispute between Bow Wow and the woman at 4:15 AM Saturday. When they arrived, the woman claimed Bow Wow assaulted her. He claimed it was the opposite.

Both Bow Wow and the woman sustained visible, minor injuries.

Police identified the woman as Leslie Holden. We cannot find any relationship between her and Bow Wow.

Cops couldn't figure out which one was the true aggressor, so they arrested both and charged them with misdemeanor battery.

Bow Wow had been promoting a Super Bowl pop-up shop for his mom during Super Bowl weekend. He was also spotted at Shaquille O'Neal's SB event -- called Shaq's Fun House -- not long before his arrest.

Check it out ... he's introduced by Jermaine Dupri and gets a pretty big reaction from the ATL crowd.