Cee Lo Green becomes grandfather at 35

Cee Lo Green has announced that he has become a grandfather.

The 35-year-old singer revealed that his 20-year-old daughter Sierra recently gave birth to a baby boy.

Speaking on chatshow Chelsea Lately, Cee Lo said: "I'm a grandfather. I'm 35. She had a son so I have a grandson."

The 'F**k You!' singer also spoke of Sierra's previous appearance on MTV's My Super Sweet 16, admitting that the programme makers had to bend the rules for her edition.

"She was actually turning 15 on that show," he confessed. "MTV took a liking to her and they allowed her to be an exception for this show."

Cee Lo is currently celebrating a nomination for 'Record Of The Year' at the 2011 Grammys.