The music band, comprising of Max George, Jay McGuiness, Siva Kaneswaran, Tom Parker and Nathan Sykes, think the 18-year-old Canadian heartthrob would fit in perfectly with them, reported MTV online.
"Bieber would be absolutely mint," Sykes said.
The 'Glad You Came' hitmakers are also convinced Bieber would gain them even more female fans.
The boys receive thousands of letters and packages from their admirers but they said that not all the fan mail they receive is appreciated.
"One of us got sent a voodoo doll before," Sykes added.