Prince Jackson has graduated from Buckley High School in Sherman Oaks, California on Saturday, May 30.
An eyewitness tells Us Weekly Magazine, "When they announced his name, the whole Jackson family stood up and cheered and whistled. Prince was ecstatic as he crossed the stage and picked up his diploma."
The onlooker adds that Prince's family sat in the front row for the ceremony and the graduate posed for photos with his loved ones at the reception.
His younger sister Paris, in particular, seemed "very proud" of him."She was fixing the collar on Prince's shirt and gave him a big hug and congratulated him, the insider adds.
Prince's milestone comes shortly after news that his dad's Neverland Ranch is up for sale for a whopping $100 million.