Beyonce cries on camera about missing hubby

London: Beyonce Knowles broke down when she revealed her lonely life and all `on the road` documentary called ‘Beyonce: I Am...World Tour’ that was screened in the US Thursday night.

In heart-breaking scenes, the 29-year-old multi-millionairess superstar appeared make-up free as she wailed.

“Sometimes it’s overwhelming. Why did God give me this life? Only God knows. And I don’t take it for granted,” a daily quoted her as saying.

The ‘Single Ladies’ singer, who rarely speaks about her rap mogul husband Jay-Z, added: “I’m flying home today. I miss my baby.”

Beyonce, who has sold more than 11 million albums worldwide, said the hardest clip to leave in the documentary, aired on ABC as a Thanksgiving special was when she was in China.

“There was one moment I was in China and I was in this huge suite and I looked out the window and there were just thousands of people walking and I couldn’t believe my life,” she said.

“I guess I was a bit lonely and I wanted to talk to someone so I opened up my computer and I just talked,” she said.

The singer reveals in the concert special that she appreciates her position more now than when she was younger.

“Now when I win six Grammys in a night I know to soak up every moment. I appreciate how incredible it all is,” she said

She also reveals she is not pregnant but is “getting close” to the day she wants to become a mother.

“Nothing now but there will be one day,” she said.

“One of the reasons I haven’t had a child yet is because there are certain things I want to do before I focus on being a mother,” the star added.