Big-hearted Taylor Swift has made a terminally ill four-year-old girl's wish come true by chatting to her over the web.

The 25-year-old pop superstar spent around 20 minutes on FaceTime with Jalene Salinas on Monday, as the brain cancer sufferer's mum sat beside her on the sofa.

"I'm so sorry you’re having a bad night," Swift told her. "I'm so happy to talk to you though and I'm so happy you like Shake It Off.

"You look beautiful tonight, you really do. You're just as pretty as your pictures."

As well as chatting with Jalene, they also had a little dance together to Shake It Off.

Speaking to the girl's distraught mother, Swift said: "I got back from London and I heard about her. It's just... unfathomable to have to watch your baby go through this."

Supporters had got T-Swizzle's attention by using the hashtag #ShakeItOffJalene on social media.

And their chat has now gone viral after a segment about it was broadcast on the TV news in Texas.