Yes, it is backbiting!

Sheikh, a famous boxer has a wife that has her own youtube channel. They are muslim. She makes makeup videos. Lately i noticed she looks different her lips are very big unnaturally. I told my sister “she looked much better without surgery and i think she got lip injections” is this backbiting? She is a famous person

Backbiting | July 25, 2015 2:48 am
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If someone tells me something about a third person and ask me not to disclose to anyone else then if I tell it to a fourth person will I be sinful?
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There’s a lot of backbiting and gossiping in reality shows, If i watch it and hear someone backbite/gossip, does all my good deeds go to the person that’s being backbited on?