"Everyone always asks that, you know? And here's the real answer, is no!" Bass said. "We were not."
However, Timberlake was invited to Bass' December 2014 wedding to painter Michael Turchin, though the "Mirrors" singer was unable to attend due to a scheduling conflict.
"His last day of his tour was my date, and my anniversary is December 20, so I had no idea people would actually tour up until that close to Christmas," Bass explained.
Although, Bass, 36, wasn't missing all his NSYNC boys on his special day -- Joey Fatone, Chris Kirkpatrick and JC Chasez were all in attendance.
Kirkpatrick talked about not getting invited to Timberlake and Biel's wedding in October 2012, and chalked it up to the 35-year-old pop superstar not wanting to take the spotlight away from his bride.
"I wasn't invited to the wedding and from what I know, it's because he didn't want all of us there," he told Orlando morning radio show Johnny's House (via Billboard). "It would be a reunion rather than a wedding. It was her day. She's amazing so he wanted to make sure it was about her."
NSYNC did briefly reunite onstage in 2013, when Timberlake brought out his boys during one part of his lengthy performance at the 2013 MTV Video Music Awards, accepting the Michael Jackson Video Vanguard Award.