For devoted fans of the Elizabeth Gilbert book that has been adapted into a film opening Friday, "Eat Pray Love" isn't just a title, it's a mantra. Similarly, fans of MTV's "Jersey Shore" know about mantras: The cast made a ritual out of "gym, tan, laundry," and followers quickly adopted GTL. So when MTV News hit the red carpet on Tuesday for the New York City premiere of "Eat Pray Love," we just had to ask: when it comes to words to live by, is it "eat, pray, love" or "gym, tan, laundry"?

A somewhat clueless Julia Roberts was stumped. "What's gym, tan, laundry? Oh, I've heard of 'Jersey Shore,' " the star said to MTV News. And it seems she wasn't the only one of the "Eat" stars who had no idea what we were talking about.

"I don't know that one. I thought you were going to say, 'Suck it,' and I was [going to be] like, 'That's not three words, to begin with, and that's not a mantra,' " Billy Crudup explained. "Is that MTV?" the actor asked. "Oh, I know 'Warren the Ape.' That's MTV. I've been on it."

So, does Javier Bardem start his day with GTL?

"No. Gym, tan, laundry ... no. No, no! I don't even know what that means!" the Oscar-winner laughed. "I will look for it in the dictionary."

And fans of the "Jersey Shore" can add star Richard Jenkins to the list of people who have no idea what the heck gym, tan, laundry is. "No, I don't. I don't," he confessed. "I watch 'So You Think You Can Dance.' "

"Glee" star Mike O'Malley, however, was more familiar with all things "Jersey Shore."

"Well, I know all about these kids. I know about JWoww, Snooki. I'm trying to get abs like the Situation," he joked.

"I'm all about the tanning and the laundry," "Eat" director and "Glee" creator Ryan Murphy said. "I'm too old to be tanning. I love those guys on that show. I think they're funny and amazing and quite brilliant at what they're doing."