Williams, 33, is working on her new solo album 'Journey To Freedom' which will feature singers Beyonce Knowles, 32, and Kelly Rowland, 33, reported Contactmusic.
"No matter how much we try to separate ourselves when we're together, it is what it is, this is the group," Williams said.
"It's not going on a Destiny's Child album, it's going on my album featuring Beyonce and Kelly, the same way Kelly featured us on her album," said Williams.
The trio also made a promise to continue teaming up on each other's solo projects.