A svelte Spelling joins her family for a getaway to Maui. Plus: Ashlee & Bronx, J. Lo and more

THE 'JETT' SET

You're supposed to be seeing double! Following in her footsteps – literally! – Twilight star Kristen Stewart shadows rocker Joan Jett while out in Burbank, Calif., on Tuesday. The actress will star as the legendary guitarist in the biopic The Runaways.