Steven Tyler says it's possible to be a rock star and maintain a monogamous relationship.  In an "Entertainment Tonight" preview of Tyler's appearance on Oprah Winfrey's new series, "Oprah's Next Chapter," the Aerosmith frontman admits that he could have been faithful to his previous partners, and he regrets that he wasn't.  He explains that in "all the divorces" he's experienced he "hurt those girls deeply."  Steven also confesses that "there was some behavior" that he's "ashamed of" and "shouldn't have done."  For the show, Tyler welcomed Oprah to his New Hampshire home and shared details about his life, including his addiction battles and his "next chapter" as a judge on "American Idol."  He's featured on the special two-hour launch of "Oprah's Next Chapter," which will air on OWN on January 1st at 9:00 p.m. Eastern.