According to TMZ.com, AEROSMITH singer Steven Tyler recently proposed to his longtime girlfriend Erin Brady.Brady, 38, was spotted wearing a diamond ring on her wedding finger during a Christmas vacation with Tyler in Hawaii and sources tell TMZ.com she's set to become the singer's third wife. Previously an accountant for Tyler on tour, Brady told Oprah Winfrey in a recent interview that although she bore witness to the worst of Steven's bad-boy behavior, she knew his ways could be reformed and she wanted to be the one to do it. "I saw him, how he behaved… badly," she said, according to ETOnline.com, telling Oprah she had to step up to the plate as the womanizing continued when their relationship became romantic. Her strategy was to "play" as he would when Tyler would stray, which he admits was a wake-up call and an instigator towards treating the women of his life with the respect they deserve. "There was some behavior I am ashamed of and I shouldn't have done," Steven explained. When asked bluntly if he believed he could remain monogamous with Erin, Tyler confidently replied that he could. "I don't want to hurt anybody again," he said. "For all the divorces I've had I've hurt those girls deeply." Steven and Erin have been dating for five years, since Tyler divorced Teresa Barrick. He was also married to Cyrinda Foxe from 1978 to 1987.