Just one more week to go before 'Transformers: Revenge of the Fallen' explodes into theaters and IMAX, and ET's Mark Steines has new behind-the-scenes secrets!

Shia LaBeouf tells ET that he didn't hesitate to respond when director Michael Bay called him for the mega-sequel. "Oh yeah, for sure -- because [the phone's] not even listed as Michael Bay -- it's just listed as pick up."

And Tyrese Gibson says of working on the sequel, "We just had the time of our life, man. We were out there in the white sands -- that's where you came [to visit]."

The star has nicknames for various co-stars and crewmembers, calling Bay "Boom Boom Bay-ster" and Megan Fox "Foxy."

"We have a thing -- sometimes where you look good on camera, but I wonder how you look in person for real," he says. "Megan Fox is every bit of a fox when you see her in person."

'Transformers: Revenge of the Fallen' hits conventional theaters and IMAX on June 24.

For more movie news and exclusives, head over to ETonline's Summer Movie Guide!