Justin Bieber made it clear immediately after he ducked an Orlando Bloom punch -- he was not shaken or rattled.
Justin and a buddy mocked the thwarted punch in the parking lot of Cipriani ... where the altercation went down.
Justin also chatted up some female fans ... knowing of course the photogs were clicking away.
As we reported ... some eyewitnesses claim Justin essentially told Orlando he banged Miranda Kerr... something she has denied.
Even though Justin made it look like the whole thing just rolled off his back ... it was clearly on his mind because hours later he posted a sexy pic of Miranda, and then quickly took it down.
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