Ah, the wonders of birthday booze. On Monday's season premiere of "The Hills," mortal enemies Lauren and Heidi seemed to bury the hatchet during Lauren's birthday fiesta. There were tears, hugs and a promise to "have a drink and go from there." Unfortunately for Heidi, Lauren's hangover spelled the end of all that. At least she gave "Hills" loyalists one more thrill before the end, right?