Katie Hopkins' weekly LBC show was coming to an end this morning when Russell Brand charged in.
She had been busy speaking to a caller about the Swedish terror attack when she was forced to put that on hold to deal with the celebrity intruder.
Russell Brand, who is hosting a new show on Radio X, caused so much havoc that Hopkins told her producers to cut to the news.
She then began to tell off the eccentric comedian, before ordering him to leave the studio immediately.
Katie Hopkins' weekly LBC show was coming to an end this morning when Russell Brand charged in
Just before the disruption, the firebrand LBC host had been speaking to Paul, from Croydon, about the Sweden terror attack
She was just minutes away from handing over to Maajid Nawaz when Mr Brand ran into the live broadcast.
He took hold of Nawaz's microphone and innocently apologised for the interruption.
But, Hopkins wasn't having any of it and quickly shut down the comedian for being rude.
The LBC host telling off the eccentric comedian
Hopkins shocked by Brand's storming in
Get Quotes on Home Insurance
Russell Brand, would you mind leaving my studio and I will deal with you after, you naughty child?
She said: "Russell Brand, would you mind leaving my studio and I will deal with you after, you naughty child?
"Have some sense of diplomacy. Poor Paul here was just making an important point."
Mr Brand blamed the prank disruption on a "misunderstanding" before claiming that the LBC host had invited him in.
Brand commandeered the microphone
Hopkins warning her producers about the incoming Brand
But Hopkins refused to give in and told her producers: " We are going to the news where you like it or not.
"Russell Brand, out with you!"
She later tweeted Mr Brand: "Did you mother never teach you to knock?"