Nicole took to her Instagram to speak about the abuse she's received since her romance with Brad became public. [Image: Instagram]

Brad Pitt's new girlfriend Nicole Poturaski has hit back at trolls who've criticised her relationship with the actor amid his divorce from Angelina Jolie. Nicole took to her Instagram to speak about the abuse she's received since her romance with Brad became public.

Speaking in her native German, Nicole asked: "Hey guys I have been wondering since forever why people leave hateful comments? "Why? What is the benefit? Just in general, I want to understand the train of thought."

27-year-old Nicole, who has been described as a mix of Brad's exes Angelina and Jennifer Aniston then said she found people commenting on her relationship 'sad.' She hit out: "It’s just so rude and sad for those commenting. Just don’t follow people you don’t want to see or [if you] don’t like their content. Easy."

Nicole, who is said to be in an open marriage with restaurateur Roland Mary, 65, is rumoured to have been dating Brad, 56, since summer. The German model's relationship with the Hollywood heartthrob was uncovered back in August when they were spotted jetting off on a romantic trip to France together.

Also read: Brad Pitt's kids haven't seen his parents for years

The pair spent time at Chateau Miraval, the same estate where Brad married Angelina Jolie in 2014. Sources at the time said Brad 'didn't care' about the awkward location choice.

Brad is currently locked in a custody battle with his second wife Angelina over their six children. The Troy actor is said to be wanting 50/50 access to Maddox, 19, Pax, 16, Zahara, 15, Shiloh, 14, and twins Knox and Vivienne, 12.

The Mr and Mrs Smith co-stars split in 2016 but are still finalising the details of their divorce with their custody hearing beginning this week. Brad's legal team are planning to call up Angelina Jolie's Girl, Interrupted co-star Jillian Armenante to testify in the case.

According to US Weekly, a witness list filed from Brad includes Armenante, who starred with Jolie on the 1999 movie. Psychological thriller Girl, Interrupted followed a young woman detained at a psychiatric hospital after a supposed suicide attempt.

Also read: Brad Pitt thinks Angelina Jolie has gone too far in custody battle