Bieber: pop singer, do-gooder. (Eric Gaillard - Reuters) For the next several paragraphs, I advise all Celebritologists to check their cynicism at the door. Because what follows is a feel-good, charitable story involving Justin Bieber. And try though you might, it may be hard to prevent your Valentine’s Day heart from growing at least a couple of sizes after you read it.

Last week, a Fox affiliate in Massachusetts profiled a 6-year-old girl named Avalanna Routh, who has a rare and often fatal form of brain cancer caused by what’s known as an AT/RT tumor. Like seemingly most little girls, Routh also possessed a dream: to meet Bieber.

The staff at a Methuen, Mass., salon, where Avalanna sometimes goes after cancer treatments, started a campaign to attract attention to the child’s interest in meeting the pop sensation.

A Web producer at Fox 25 in Boston found out about their efforts. And he just happened to know someone who knows Scooter Braun, Bieber’s manager.

Long story short: Yesterday, Avalanna was flown by Team Bieber to New York, where she spent some time with her idol.

“that was one of the best things I have ever done,” Bieber tweeted late Monday afternoon. “she was AWESOME! Feeling really inspired now! #MrsBieber.”

He later followed with another tweet and a photo.

BEST PART OF MY DAY twitter.com/justinbieber/s…

— Justin Bieber (@justinbieber) February 14, 2012

Of course, this was a lovely publicity opportunity for Bieber, who was photographed the day before Valentine’s Day hugging and kissing a sweet cherub wearing a shirt that said “Be mine.” (Cynicism, didn’t I tell you to pipe down?)

And it’s also surely raising the profile of Fox 25 in Boston, which, one could argue, got a story by inserting themselves directly into it. (Cynicism, seriously — do you not listen?)

But that doesn’t change the fact that this was a nice thing for Bieber to do. I cranked up the air conditioning in my soul. And still, my heart was warmed by this.

6-year-old with brain cancer lives her dream of meeting Justin Bieber : MyFoxBOSTON.com