The 30-year-old supermodel, who parted ways with Bloom, 36 recently, was pictured getting cosy with Bieber, 19, after a Victoria's Secret fashion show last year, reported Daily telegraph.
Bloom, who has a son Flynn with Kerr, was apparently unhappy when his son was taught to say 'Bieber fever'.
"Miranda had always claimed that she was a fan of Justin's music. She has taught her son how to say Bieber fever but it is supposed to have caused an issue," the source added.