EXCLUSIVE: Rihanna burst into tears as police arrested her baby in front of her!!

Police arrested Rihanna's baby father A$AP Rocky yesterday - and later raided his home - although it's not yet clear what they were looking for.

Turns out the local police have been working for a while to build a HUGE case against A$AP, and it looks like they finally got it. And it feels personal.

According to a person close to A$AP Rocky, Rihanna's baby daddy did NOT receive a warning that he was wanted for a crime. The friend explained to Media Take Out: "The police knew they wanted [A$AP], they could have arranged for him to turn himself in. But instead they ran him down when 'he was with [pregnant] Rihanna."

A$AP got off a private jet with Rihanna and her family at an airport in Los Angeles. And the police surrounded the plane when it landed, causing CHAOS.

The arrest - which Media Take Out said took place in front of Rihanna - was described to us as "traumatic". And Rihanna has been described as "very emotional".

Media Take Out has confirmed that Rihanna was crying uncontrollably when her baby's father was taken away in handcuffs.

After A$AP was arrested, the police used a battering ram to BREAK into his house and sent in drugs, fraud and gang experts - hoping to get some evidence of any other crime.

But even if the police find no OTHER crimes committed by A$AP, he faces 20 years on the shooting charges.

Tags a$ap rocky arrest rihanna