What do [movie id="369195"]"Twilight"[/movie] star Cam Gigandet, Steve-O, "Gossip Girl"'s Leighton Meester, [artist id="2584573"]Vampire Weekend[/artist]'s Ezra Koenig and rapper Nicki Minaj all have in common? Well, for one thing, they all graduated from high school. And with each high school graduation comes unique memories -- in some cases, really unique memories. (Check out the [article id="1613889"]Jonas Brothers' graduation memories right here.)[/article]

"Jackass" star Steve-O -- who was attending school in London at the time -- spent his pre-party in jail. "I got arrested the night before high school graduation," he said. "It was like 5 o'clock in the a.m. when they let me out of the drunk tank."

Although Steve-O eventually made it to his graduation, "Gossip Girl" star Leighton Meester managed to miss her ceremony. "I didn't go to my high school graduation," she said, explaining, "I graduated a year early out of a small private school that was different then my school. I went to Beverly Hills High School. But I'm OK that I missed it -- that week I was in Hawaii, working."

And although "Twilight" star Cam Gigandet didn't have anything momentous or unusual happen to him when he graduated, the man voted "Best Dressed" by his classmates does admit that by the time graduation rolled around, he was over it. "I was so ready to move on that I just stuck my head down and all I could focus on was the end," he said. "Towards the end, I'm not sure if I had any friends either."

But he is almost certain of one thing about his look back then: "I think I had hair down to here," he said, pointing below his ears. "I have my 10-year reunion coming up, so I'll ask them."

[article id="1610492"]Rapper Nicki Minaj[/article] attended LaGuardia High School, on which the movie "Fame" is based, meaning that hanging out in dressing rooms was part of the curriculum. "What was great for me in high school was the fact that I was a drama major and, being a drama major, we had a dressing room," she said, adding that "it allowed us to be able cut class and go somewhere and just be silly all day. We would do, like, beating on the table and making up rhymes. When we graduated we were, like, on the boat!"

So, leave it to the rocker in the group to have the most typical of high school graduation experiences. "I was in this white tuxedo," Ezra Koenig of Vampire Weekend, [article id="1613579"]who we caught up with in the studio[/article] last week, said. "With, like, really curly, shaggy hair, giving a speech on the baseball diamond of my high school."

Welcome to Class of '09 Week on MTVNews.com, where we're celebrating a memorable time in the lives of more than 3 million high school seniors: graduation! We'll be rolling out articles and videos with graduation memories from your favorite celebrities and much more. Be sure to upload your own three-minute video for our Class of '09 Valedictory Search to Your.MTV.com -- the winner will be flown to New York for lunch with MTV News' Sway and will attend a taping of MTV's new series "It's On With Alexa Chung."