Real Housewives of Beverly Hills star Russell Armstrong had secrets about his sexual preference that were about to be revealed, and RadarOnline.com has exclusively learned that some were already discovered by his estranged wife, Taylor Armstrong.

According to sources close to the 47-year-old, he was bisexual and worried that a tell-all book was going to out him, along with Taylor.

"About six months ago Taylor confided in a close friend that she'd found history for a gay website called Adam4Adam.com on Russell's laptop," the insider told RadarOnline.com.