The new mum, who briefly dated singer Louis last year, was thrust into the spotlight after becoming pregnant with the first 1D baby.
And many fans were NOT happy...
Meet my little lad, Freddie pic.twitter.com/nec7OqwuQR— Louis Tomlinson (@Louis_Tomlinson) January 28, 2016
The stylist has reportedly suffered at the hands of Twitter trolls and is now suing them, says the Daily Mail.
The newspaper reports that Briana, who gave birth to son Freddie Reign last month, has been the victim of online abuse ever since her pregnancy was first reported.
Now a family source says she's decided to get lawyers involved in an effort to get 1D fans to leave her alone.
The insider said: "It has been an onslaught. The fans are attacking and breaking in to our social media profiles, trying to get our passwords, [and] calling our homes at all hours of the day and night.
"We have tried to ignore much of it, but recently some fans have crossed the line and we have instructed attorneys to get involved. When somebody starts getting belligerent then that's when the attorneys get involved."
They added that they just want to be left alone because they are at the "end of their rope".
Briana chose to remove herself from social media at the time her pregnancy was announced, tweeting: "I am just gonna disconnect my account. I am so freaking done. People pretending to be me. People calling me names. What's wrong with ya all?"
Freddie Reign arrived on 21 January. Louis confirmed it with a tender image of himself cradling the newborn.
He wrote alongside the image: "Meet my little lad, Freddie" and later thanked fans for their support with a tweet, saying: "Thank you so much for all the nice messages."
It's believed that Louis was by Briana's side as she gave birth to the star's first child, as he's currently spending time in California to be close to the new mum and baby.
Briana and Louis went on a series of dates in May 2015, shortly after he split up from his long-term girlfriend Eleanor Calder.
He confirmed that he was going to be a dad during a chat with Good Morning America last August, telling fans he was "buzzing" to become a dad.
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