P.Diddy feels blessed that his oldest son has graduated high school.

The rap mogul can't believe 18-year-old Justin - his son with former girlfriend Misa Hylton-Brim - is finishing school and says he can't explain how proud he is.

The father-of-five - real name Sean Combs - tweeted: ''My son graduates today! Wtf! Justin is graduating High School! Words can't explain. God is the greatest!! (sic)''

Although he is only just graduating high school, Justin already knows what he'll be doing for the foreseeable future.

In February, Justin will be playing football at UCLA, after officially signing his national letter of intent on National Signing Day, with his proud father looking on.

Diddy - who wore a smart tailored suit and dark sunglasses, as he sat by his son - applauding as Justin put pen to paper and put on his new UCLA cap.

Speaking about his love of football at UCLA, Justin has said: ''It was love at first sight. When I stepped on the campus, I knew I was going to be a player there. I knew I just had to get there.

''It's going to be surreal at first but then at the end of the day you've got to go to work and you've got to get what's yours and show why you've been working hard. So I'm ready for that. I can't wait.''

Justin accepted the full Division 1 scholarship to play for the Bruins at the California university, which costs up to $54,000 a year, over Wyoming, Virginia and Illinois.