Is it sinful to read articles about celebrities or talk about them? Is that like backbiting? I know this question is a little strange but it just struck me.
It is only backbiting if you mention a negative fact about someone that would upset them if they heard it. So some types of celebrity gossip can be considered backbiting. But that gossip is public knowledge, it is not a very serious form of backbiting.
The Quran also forbids us from spying on others. Much celebrity gossip comes from journalists spying on them to find out facts about them.
Since there is often an element of backbiting and spying in celebrity gossip, it is best to avoid it and not seek it out.