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Fancy meeting you here -- Ronan bumps into Mel B

SO this is what happens when a Spice Girl enters a Boyzone ... nothing.

They work side by side on Australian X Factor, so it was all smiles when judge Ronan Keating bumped into presenter Mel B (37) at Bondi Beach.

Ronan (35) was accompanied by children Jack (13) and seven-year-old Missy when they bumped into Mel, who was being put through her paces by a personal trainer.

Doting dad Ronan was showing his two children the sights and sounds of Sydney when he unexpectedly ran into fitness enthusiast Mel.