They've often spontaneously performed together during their solo shows, and Jay-Z is keeping up that tradition, by taking to the stage with Beyoncé at the Chime For Change concert.

The 43-year old rapper is rumoured to be joining his wife - who is headlining the show at Twickenham Stadium in London - to help put a spotlight on girls' and womens' issues.

"I was 202 pounds when I had my son. But I'm tall, so it didn't look like it. I have a really good personal trainer. I work out every day, an hour and a half a day."

"It's hard to get off baby weight. It's a different kind of weight because for nine months you stretch your stomach out and then it's hard to get that back. I'm working on it. I lost like 30-some pounds already."