The Big Brother 8 winner teamed up with the Grimes brothers on Big Brother's Little Brother last week for a performance of 'Ghostbusters'.
"[It was] a very surreal experience," Belo told Heat. "They were terrific lads and it was great to have them join our Big Brother pandemonium.
"I definitely think they'll have a much deserved number one single with 'Ice Ice Baby' after their entertaining NTAs performance."
John & Edward release their debut solo single 'Under Pressure (Ice Ice Baby)' at the end of the month.