Environmental cheerleader Hayden Panettiere was in Beverly Hills yesterday, where she continued her quest to save her blowhole'd buddies with this message: "Make a change!"

The fin-loving fox recently jetted over to Japan to join ranks with the anti-whaling group Sea Shepherd -- and wear a bikini -- in an effort to raise awareness about the killing of whales and dolphins by fisherman.

Hayden proclaimed, "Wherever the problem goes, I hopefully will follow." As long as she's in a bikini, so will the photogs.