It was Molly who heard it first.

She had been walking with Victoire to Charms when they passed a group of fourth year boys. Molly, with her excellent hearing, was the one of the two Weasley's to hear what they were talking about.

"Yeah, the Hogwarts Heart Breakers."
"That's what everyone's calling them."
"Well, it fits, don't you think?"
"All of the Weasley-Potter girls are off limits, you know."
"But they're all so hot!"
"Exactly why they're called the Hogwarts Heart Breakers, you thickheads."
"No one can ever be with them for long."

Molly didn't say anything, just continued on her way with Victoire, and, like always, was excellent in Charms. But, even so, the redhead couldn't get it out of her head.

They weren't heartbreakers!
They were the sweetest girls in school!