Stevie Nicks has signed on to join old pal Tom Petty on the road for what is billed as the grizzled rocker's last tour. The FLEETWOOD MAC star, who scored a huge hit with Petty and his band THE HEARTBREAKERS in 1981 with STOP DRAGGIN' MY HEART AROUND, will support the rock group on the first eight shows of their upcoming Highway Companion tour. Nicks will also join Petty and his band for a handful of duets onstage each night.