Juliette Lewis has a reputation for being somewhat of a wild child. But the 36-year-old actress-singer says she is mellower than people would think. “I would rather be on the road with my band or traveling than out partying,” says Lewis. The actress, who co-stars with Drew Barrymore in “Whip It!” and stars opposite Jennifer Aniston in next year’s “The Baster,” opens for the Pretenders on a U.S. tour that comes to the Denver Botanic Gardens at Chatfield on Saturday. Her new album, “Terra Incognita,” will be in stores Sept. 9.