Rihanna has been so busy preparing for her big Diamond Ball that she can't be expected to remember EVERYTHING!
Her Diamond Ball is a black-tie fundraiser that will benefit The Clara Lionel Foundation, which RiRi started in honor of her grandparents, so clearly she's super involved in the whole process — and when you're that busy sometimes things get mixed up in the jumble.
One little detail that slipped Rihanna's mind while preparing for her ball was the fact that Kanye West never announced he was touring North America in 2015!
But she totally just did! Whoops!!
It all started when she tweeted: