After spending some time on the Broadway circuit, Michelle Williams is back on her music grind, prepping her Journey To Freedom album for release this fall. One of the project's lead singles is "Say Yes," which features her Destiny's Child girls, Beyoncé and Kelly Rowland.

Fans were thrilled to see the ladies come together again, but Williams says that this was always in the plan. "It feels wonderful [to work with them], and no matter how much we try to say it's not a Destiny's Child song [it doesn't matter]," she told MTV News, laughing.

"It's not going on a Destiny's Child album, it's going on my album featuring Beyoncé and Kelly, the same way Kelly featured us on her album. But no matter how much we try to separate ourselves when we're together, it is what it is -- this is the group."

Williams explained that she and the girls made a pact to keep working on each other's solo projects, and they definitely kept their word.

"There was an interview we did some years ago saying that we would participate, in whatever capacity, on each other's solo projects," she explained. "Whether that is appearing with Beyoncé from time to time on her tours, or on shows, or Kelly's album, so this was my turn now to have them on an original song on my album."

Check out the video below.