The whole Robert Pattinson-Kristen Stewart thing doesn't seem to faze Cameron Diaz

The 40-year-old was allegedly all over Pattinson on Oct. 27 at the L.A. County Museum of Art's Art + Film Gala, according to Us magazine.

I'd make a "Mrs. Robinson" joke here, but anyone interested in this story probably wouldn't get it.

"She was pretty obvious," says one of three witnesses who watched Diaz come on to the 26-year-old "Twilight" star. "Cam was seated next to Rob at dinner. She was touching his arm, doing her big Cameron laugh at everything he said and trying really hard. He was polite, but not having it."

He should've bitten her.

His non-interest shouldn't be surprising. Just two days earlier, Pattinson and Stewart couldn't keep their hands off each other at a Prince show at Hollywood's Sayer's Club.

"They were inseparable -- kissing passionately," says a concertgoer. "It was like watching one of their movies"

That bad, huh?

Just kidding, Twihards. Please don't come to my house.

The pair even danced together. "Rob was grinning the entire time," said the onlooker.

Contact Tony Hicks at thicks@bayareanewsgroup.com or on Facebook at www.facebook.com/BayAreaNewsGroup.TonyHicks.