The former Spice Girl described video footage of Tomlinson colliding with a photographer and helping his girlfriend, Eleanor Calder, who was seemingly pinned against a wall by two girls, as “chaotic”.
Speaking on Good Morning Britain she said celebrities have a “fight or flight” response to the paparazzi.
“It’s actually quite traumatic,” she said. “That sounds a little overdramatic, but there are times, I should imagine with Louis and what the boys have been through, that they have been at the height of their success and they are constantly pursued.
“You come into an environment like that and it’s quite frenzied and it’s quite chaotic and you have a fight or flight response.”
The singer said she found herself in a similar situation when she was in the Spice Girls.
Recalling the incident she said: “I know it's a very long time since I've been in that situation but I had one time many years ago towards the end of my time with the Spice Girls and I was pursued in a car.
“I ended up hitting the car because you don’t think. You’re not in a sensible frame of mind. I really feel for Louis.
“He shouldn’t have been left in that situation. He needs security.”
Tomlinson was released on bail following the fracas over the weekend. In video footage he can be heard shouting: “Excuse me what is happening here? What the hell is happening? Can we have some help?”
He can then be seen rushing to Calder. He pulls a girl away from her and shouts: “That’s my girlfriend.”
He said: “I’m with Louis, I’ve watched the footage and I think he was treated appallingly.
“He was just defending his girlfriend.
“I feel sorry for him, he was just getting bothered at the airport by fans, get over yourselves.”