After the Teen Awards Little Mix stopped by Radio 1 for an interview and Perrie told Leigh Anne she got Justin Bieber to record a birthday message for her. He was busy touring, but she told Zayn about the idea, and he asked Bieber. Their interview starts around 20 mins @ 22 HERE.
They talk about other performances and perrie says she was proud of Zayn. Leigh Anne says she likes Bieber, and Jelena. @23:30 Perrie Surprises Leigh Anne about Bieber’s Message. And Leigh Anne starts tearing up. @ 28 their interview continues after their song was played @29 Perrie talks about how she got him to make the video (she got Zayn to ask).