Is Cameron Diaz's spring fling with Gerard Butler already flung? The beefy "300" actor, who's reportedly been spied cozying up with the giggly actress in recent weeks, is undiplomatically denying they're an item.

When confronted by paparazzi during a tank-topped jog Thursday in Los Angeles, Butler cheekily downplayed the dating rumors, zinging, "If I take my dog for a walk, apparently I'm [bleeping] my dog."

He then clarified that the wooing talk is "not true, no."

(When contacted for comment, the Scottish actor's pooch issued a terse "no comment" and went back to munching on Snausages.)

Still, People magazine reports Diaz and Butler have lately "kicked off a steamy courtship," with the two supposedly snuggling up at hot spot Teddy's on March 29 and popping by Robert Downey Jr.'s April 4 birthday bash at the Chateau Marmont, where they mingled with Reese Witherspoon and Jake Gyllenhaal.

"She has been seeing a little of Gerard," a mole tells the mag.

Cameron Diaz finds flowers on her car left by a fan in Malibu, Calif., on April 9

But Cam, who yukked it up on "Saturday Night Live" last weekend with her "What Happens in Vegas" co-star Ashton Kutcher, has also been seeing a little of Diddy.

They were seen sipping martinis with "arms intertwined" at the bar of the Beverly Hills Hotel on April 5, according to People.

But Diaz, 35, has made it abundantly clear she's in an oats-sowing phase. On the heels of her admission to British GQ that she's "boy crazy," she tells the May issue of W that she's just trying to live life to the fullest.

"I'm in love with love. I'm in love with life," she bubbles to the magazine. "This year I just sort of decided, you know, there's a lot of things that I've been wanting to do, and I'm going to do them."