Creators of “The Simpsons”; wanted to keep Justin Bieber’s upcoming cameo a secret, but the big news quickly leaked on to the web and the show’s Executive Producer, Al Jean, says he was shocked to find out how the news broke. “Justin came in;  it was top secret we were going to hold off, his people said we don’t want it leaking out – then he tweeted it!”; He adds with a laugh, “All right, secret’s out!”; Justin’s episode doesn’t air until spring 2013, but we have the scoop – he’ll be competing with Bart in a talent show. The twist Al reveals is, the world’s biggest teen superstar is “not very successful.”;

Speaking of secrets, Al shares more big names who will be heading to Springfield for the show’s 24th season: “We have an episode where Bart realizes every girl he’s ever dated has dumped him after a week, and the only one he can find who might be a hope is Zooey Deschanel.”;

But TV’s “It”; girl isn’t the only one who’s on Bart’s radar, reveals the Exec Prod: “We thought it would be fun to ask all the old girlfriends to do a cameo, so we actually got all of them.  Anne Hathaway, Sarah Michelle Gellar, Sarah Silverman and Natalie Portman.”; So even after more than 500 episodes, it seems Bart will be busier than ever!

Now don’t forget to tune-in to the season premiere of “The Simpsons”; Sunday night on Global, and watch more behind-the-scenes in the video below!