HI @KimKardashian, you're beautiful. I'm Ana Beatriz from Brazil, I'm 8. Look, you wrote Were, but it's "we're". Kisses!

Correcting other people's spelling is usually considered rude, but the grammar cops are as young as eight and nine years old and they are sending lots of love in their tweeted advice to celebrities around the world.

The campaign is part of an English language class at a school called Red Balloon in Sao Paulo, Brazil.

In an effort to impress upon her students that good English grammar matters in a world dominated by texts and tweets and fast social media communication, team leader Andrea Baena set them an assignment she knew they would find interesting.

Baena asked the schoolchildren to find their favourite celebrities on Twitter and look for spelling or grammar mistakes in their tweets.

The children chose film stars, singers and sporting celebrities including Justin Bieber, Lady Gaga, Harry Potter star Daniel Radcliffe, Kim Kardashian, Miley Cyrus, Rihanna, Pink, Shaquille O'Neal and Sylvester Stallone.

When they identified errors, students read the tweets for their classmates and explained what needed to be fixed before tweeting the advice out to the stars themselves from a school-owned Twitter feed.

They were told to be polite and allowed to use photos of themselves in the corrective tweets.

@ladygaga I'm Milena, 10 years old from Brazil. You're great but your tweet has a mistake: crowd doesn't have "e". S2 pic.twitter.com/TDWU1NKV2j — Red Balloon (@redballoonBR) April 22, 2013

@DanieIRadcIiffe Dear Harry Potter, I'm Gabriel, from Brazil. Your tweet has 2 mistakes: "it has been" and "amazing". pic.twitter.com/OqwojktYv7 — Red Balloon (@redballoonBR) April 22, 2013

Hi, @justinbieber! My name is Maria, I'm 9 and I'm a fan from Brazil. Watch out: it's "we're here" not "we here". : ) pic.twitter.com/hJ2b1u8MsS — Red Balloon (@redballoonBR) April 22, 2013

In a video explaining the assignment, Ms Baena said the point of social media was "how fast it is", but that it was a bad lesson for children who needed to properly grasp written English.

"We have celebrities that are not really worried about the language," she said.

"Concerning education, it's really bad, because when [children] see their idols speaking like that they come to us and say 'but this is right, he's American, he's using it'."

How would you react if someone corrected your grammar and spelling on Twitter?

Continue the conversation @candacesutton1 | @newscomauHQ | candace.sutton@news.com.au

@KimKardashian, you're beautiful. I'm Ana Beatriz from Brazil, I'm 8. Look, you wrote Were, but it's "we're". Kisses. pic.twitter.com/warKOfU1FX — Red Balloon (@redballoonBR) April 12, 2013

@aplusk Ashton, I'm Fabiane, I'm 8 years old, Brazilian. Look, you made 2 mistakes: "T-shirt" and "America". Kisses! pic.twitter.com/DIfh5PBTFm — Red Balloon (@redballoonBR) April 15, 2013

Hi @rihanna! I love your songs. My name is Carolina. I'm 11 years old. It's not to she, it's to her. bye bye . pic.twitter.com/JR8GtPW156 — Red Balloon (@redballoonBR) April 12, 2013

@iamwill I'm Erick and I'm 9. Will, you wrote its and ganna. The correct is "it's" and "going to". Hugs from Brazil! pic.twitter.com/sAaWGWaZhB — Red Balloon (@redballoonBR) April 15, 2013

@MileyCyrus Hi, my name is Amanda and I'm a big fan from Brazil. Look, "birthday" has no Fs :) LOVE YOU! Kisses! pic.twitter.com/nUaIRuZYG1 — Red Balloon (@redballoonBR) April 15, 2013

@Pink Hi pretty, I'm Giovanna, from Brazil, I am a big fan. Look, you wrote "love able" but you meant "Loveable". <3 pic.twitter.com/k4z9GDtifq3> — Red Balloon (@redballoonBR) April 13, 2013

Hi, @TheSlyStallone I'm Theo, I'm 8 and I'm from Brazil. Look, you wrote "need" but it's "needs".Love the Expendables pic.twitter.com/2Lqxg0KsyX — Red Balloon (@redballoonBR) April 12, 2013

@charliesheen I'm Rafael from Brazil. Big fan. But man, use your "brain", not your "brane": ) Your show is great! pic.twitter.com/NUMOB29Xnf — Red Balloon (@redballoonBR) April 15, 2013

@jamieoliver you typed 3 words wrong: another, fertilizer and countries. You're the best. João, 9 years old, Brazil. pic.twitter.com/3Q8tuMHi8O — Red Balloon (@redballoonBR) April 15, 2013