McGowan and Detail began dating last year. Rumors surfaced last week that the couple was engaged after McGowan stepped out wearing a ring on a very important finger on July 17.
The actress was spotted going for a walk with Detail in West Hollywood wearing a large diamond ring. She paired the new sparkler with a white crop top and ripped jeans.
This will be McGowan's first marriage. She was previously engaged to rocker Marilyn Manson for two years before calling it off in 2001, and to director Robert Rodriguez in 2007 before calling it quits in 2009.