Bass, 34, received helpful tips and support from Biel after proposing to his boyfriend Michael Turchin in September, reported Contactmusic.
"I'm so glad I went to Chris' wedding because I forgot about some of my old management company people. And then we were sitting there talking to Jessie Biel, too, and she gave us a lot of great pointers. And she had some really great ideas.
"One really cool idea she had was that, on the invites -- because we love our onesies -- send out personalised onesies to all our guests so that at midnight after the reception it turns into a pyjama party. How fun would that be? I think we might be doing that one. That was something we both loved," he said.