Ellie told The Sun: "I'm going to write with him," adding, "He's a really good guitarist and he's funny, cheeky, really cool. He's been my friend for quite a few years so I'm really up for it."
We love that these two have stayed close over the years and can't wait to hear what they come up with together.
Is this something we can expect during One Direction's hiatus? We'll be on the lookout for something cool from Niall and Ellie!