LOS ANGELES, California (X17online) - "Transformers" co-stars Megan Fox and Shia LaBoeuf could be Hollywood's hottest new couple.

Before last night's big premiere, Megan and Shia were spotted having a romantic dinner together at La Bruschetta in Westwood.

"Megan and Shia spent the entire time laughing and smiling at each other," a spy tells X17online. "I don't think Shia took his eyes off of Megan the entire night."

Megan was wearing a sexy white dress that draped off her shoulder, while Shia wore a tailored grey suit.

After the premiere, the couple were seen sneaking out the back of the theater together.

"They didn't want to be seen leaving together, there was a ton of security around them and Megan tried to duck into the back of a waiting car," an X17online photographer said.

The couple then went to Megan's apartment in Santa Monica.

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