She continued: "Zach came out when he was ready, he did it for his own very specific reasons, and I'm wildly proud of him.
"He didn't come to me for counsel about that, but Zachary needs no encouragement from anyone. He has known exactly who he is since the day I met him... Zach has always been sexy to me, even though I knew he was never interested in me. It doesn't make him any less sexy, on screen or off."
Bell also revealed that she was glad to star in the 2010 film Burlesque with Christina Aguilera and Cher, labelling it as "a love letter to the gay community".
She announced: "I love that it's become a guilty pleasure, especially among gay people. Of course, Christina Aguilera and Cher are also very vocal in their support of the gay community, so we're all over the moon that they've celebrated the movie. Truth be told, it was really a love letter to the gay community in many ways."
Speaking about whether she would ever explore a new side of her sexuality and date women, she said: "Well, the women on that film were just so beautiful. Thank God for Dax Shepard. Unfortunately for all the women in America, he's the most charming, adorable human walking the planet, so I couldn't make the switch."