UPDATE ROM TMZ:  It's pretty clear who got the worst of the brutal Thanksgiving Day fight outside Halle Berry's house -- Gabriel Aubry is a swollen, bruised mess after Halle's fiance Olivier Martinez rocked him in the face.

Gabriel was photographed Friday in L.A., a day after his violent showdown with Olivier put him in the hospital with a broken rib and serious face contusions -- including one NASTY swollen shiner.

Olivier clearly got the better of the fight, but still screwed up his hand and his neck. TMZ broke the story ... Gabriel was arrested for battery after allegedly attacking Olivier at Halle's house.

After Gabriel allegedly pushed and struck Olivier in the shoulder, Halle's fiance cold-cocked her baby daddy in the face. There are conflicting accounts as to whether Gabriel was rendered unconscious.

As we reported, a judge issued an emergency protective order against Gabriel, requiring him to stay 100 yards away from Halle, Olivier, and Nahla. 
 

Poor thang… Lil Nahla gots so much drama in her life! Halle Berry’s household will be the setting of yet another child protective services investigation…

According to RadarOnline reports:

The L.A. County Department of Child Protective Services will be formally re-opening an abuse investigation involving Halle Berry and Gabriel Aubry’s daughter, Nahla, following the Thanksgiving brawl between her father, Gabriel Aubry, and her mother’s current boyfriend, French actor Olivier Martinez, RadarOnline.com is exclusively reporting.

“Detectives from the LAPD formally contacted CPS after Gabe’s arrest, because Nahla was present when the fight occurred,” a source close to the situation tells Radar exclusively.

“Nahla wasn’t actually involved in the melee, and by all accounts, Halle whisked her out of the driveway as soon as the fight between Olivier and Gabe started. However, DCFS was contacted because there has been a history of allegations of physical abuse. Social workers will be interviewing Halle, Gabriel and Olivier about what happened on Thanksgiving. DCFS must ensure that Nahla’s environment is safe.”

As we previously reported, while dropping Nahla off with Halle on Thanksgiving morning, Aubry got into a knock-down, drag-out brawl with Martinez.

The cops were called, and both men ended up getting treatment at Cedars-Sinai Medical Center in Los Angeles. Aubry was booked on suspicion of misdemeanor battery, posted a $20,000 bond and has a December 13 court date.

Meanwhile, Berry has reportedly gotten an emergency restraining order to keep Aubry away. The two have been in an ongoing child custody battle. Berry was recently shot down by a Los Angeles judge who ruled that she couldn’t move with Nahla to France, because Gabriel lives in Southern California.

Earlier this year, Aubry was accused of shoving Halle’s nanny while she was holding Nahla. The nanny filed a police report but the Los Angeles City Attorney failed to file charges against Aubry citing a lack of sufficient evidence.

“Gabriel is extremely concerned about his arrest and the fallout this could have on Nahla. She is his entire world and is hopeful that once the truth comes out, he won’t be formally charged with any crime,” the source says