Blue sings 'surfboard' with Beyoncé Beyonce Mon-10-Mar-14 18:25 Share this By Steph Monks So cute! A video has come out of Beyoncé rehearsing her 'Drunk In Love' performance for the Grammys. Her and Jay Z's daughter Blue Ivy has a microphone backstage and you can hear her singing 'surfboard' along with her mum. When Beyoncé hears her she says hi to her down the mic, and Blue responds saying "Hi mommy". Adorable! Watch the video here. You May Also Like Beyonce divorcing Jay Z: After Solange attacks Jay Z for cheating on Bey (report) Beyonce’s sister Solange attacks Jay Z in an elevator at the Met Gala — Watch How cute are these celebs when they were babies? Become a fan of The Edge on Facebook and on Twitter .