If the rumors are true, congrats are in order for old friend Patty Griffin. Word from the Lone Star State, where Griffin lives now, is that she and Robert Plant - yes, that Robert Plant - may have gotten hitched in recent days. Griffin, who grew up in Maine and was a fixture in Boston clubs and coffeehouses, is in Plant’s Band of Joy and the pair have been reported to be dating. This week, various websites reported that Patty and Plant were seen wearing wedding rings, and then a photo was posted on the official Led Zeppelin fan forum showing the cute couple welcoming kids to their door in Austin on Halloween. . . . Meanwhile, singer Peter Wolf joined Shelby Lynne for a few tunes at her show at Johnny D’s this week.