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There's been a major celebrity sighting in Utah's Monument Valley — where this star of money-making movies and popular TV shows is filming his next summer blockbuster.

This Hollywood big wheel is Optimus Prime, the semi-trailer truck leader of the Autobots in the "Transformers" films. And director Michael Bay is shooting part of "Transformers 4" along the Utah-Arizona border.

Paramount Pictures has released photos of a retooled Optimus Prime, along with some other new characters to the "Transformers" line-up. (The photos appeared first on the Los Angeles Times' website and on a site for OmniAuto, an Italian car magazine.)

"Transformers 4" hits theaters June 27, 2014.