The latest lie-turd that Star Magazine's pinched off involves Alyson Hannigan "starving herself" down to 98 pounds. Says an "insider" (a crazed and jealous Alexis Denishof fan? A bitter Buffy extra?): "Alyson has become extremely strict with her diet in recent months. Her weight has become her obsession: She exercises…

Turnz out everyone's favorite shirtless chest Zac Efron did a stint in rehab five months ago, while filming the upcoming Seth Rogen comedy Neighbors. E! claims it was for drinking, while TMZ says it was molly and coke — and that earlier this year Efron and some friends went on a flop-sweaty rager and caused $50,000…