Orlando Bloom and Selena Gomez -- Revenge Screwing?

If Orlando Bloom and Selena Gomez were upset when their wife and boyfriend respectively got all snuggly with each other ... they seem to have had the last laugh.

Orlando and Selena were chilling outside of the Chelsea Handler concert Saturday in L.A. ... but when a photog started snapping pics, Bloom quickly bounced.

It's interesting ... Justin Bieber and Bloom's ex-wife Miranda Kerr got VERY close during and after a 2012 Victoria's Secret Fashion Show ... a number of stories suggested VERY close.