LONDON (Reuters) – Rolling Stones guitarist Ronnie Wood is engaged to be married to a 34-year-old theatre producer named Sally Humphreys, his spokesperson said on Tuesday. The twice-married, 65-year-old musician and artist separated from his second wife Jo Wood in 2008 and had a public disagreement with her over the auction of some memorabilia in Los Angeles which went ahead earlier this month. News of the impending wedding comes just after the Stones played a warm-up gig in Paris for 350 people and announced four dates in London and New York to celebrate their 50th anniversary. …