Halle Berry poses backstage at the 66th Primetime Emmy Awards in Los Angeles, California August 25, 2014.
Halle Berry poses backstage at the 66th Primetime Emmy Awards in Los Angeles, California August 25, 2014. Reuters/Mike Blake

Halle Berry and ex Gabriel Aubry's highly publicized custody battle over the care of daughter Nahla has taken an ugly turn. The actress has recently provided a proof that Aubry has used bleaching agents and chemical straighteners in their daughter's hair. Last month Berry had accused her former boyfriend for intentionally altering Nahla's hair colour, so that she appears whiter.

Though Aubry has dismissed the allegation saying that Nahla's hair has undergone transformation due to lighting exposure and excessive swimming, the new proof may contradict his claim.

TMZ has reported that Berry has submitted a pink hairbrush to the court after getting it tested in a forensic lab. The lab has tested strands of Nahla's hair and has concluded that they have been chemically altered. "[There has been] extensive damage ... likely the cumulative effect of repeated exposure to numerous gentle bleaching treatments," says lab in its report.

After receiving the evidence from Berry, the judge has passed a decision, which clearly states that none of the parent has the right to muddle with Nahla's hair. Furthermore, in the past Berry has also accused Aubry of using a racial slang against her, as reported by Daily Mail.

Berry and Aubry started dating each other in November 2005. The Oscar winner met the French Canadian model during a photoshoot. The duo called it quits in 2010. Berry is now married to actor Olivier Martinez. They met on the sets of "Dark Tide." They announced their engagement in 2012 and exchanged vows in July 2013. The couple has a son Maceo together.

Meanwhile, despite of the bitter court battle, Aubry was seen enjoying his time with daughter, Nahla. The father and daughter duo was seen enjoying food at Joan's On Third. The model had fun with his daughter as he indulged in weird antics such as chewing on Nahla's hair, reported Daily Mail. The six-year-old was also seen sitting on her father's lap and giving him a hug.

For his fun day out with the daughter, the 39-year-old model was seen dressed in a olive green coat, cap, scarf and gloves where as Nahla wore a white jumper.