New look, new attitude?

Taylor Swift, 26, just dramatically changed up her hair — and it seems as though she's turned into a bit of a diva ever since.

Life & Style has exclusively learned that Calvin Harris' girlfriend was at a Beverly Hills restaurant when an eyewitness says, "Taylor was out to dinner with a friend, and she had a strict no-photos policy for everyone in the restaurant."

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But, her demands didn't stop there. The on-looker notes that it wasn't just photos with Taylor that weren't allowed, but photos taken from anyone in the restaurant, even if the singer wasn't nearby!

Tay's bodyguard must've been working extra hard that day since he stood in the corner keeping watch and immediately "shut down" anyone from snapping a pic.

Click through the gallery to see more celebrity diva moments caught on camera!

For more on Taylor Swift, pick up the latest issue of Life & Style, on newsstands now!