What would you do when someone says we'd look cute together?

Anonymous
Someone tells you that you and a certain good opposite-sex friend of yours are "cute together" when they watch you interact? Is it normal to just ignore the statement? Or by saying nothing, both have already acknowledged that this in fact was a correct observation, but is taboo to bring up further, since one party is in a relationship?

What would you do if you were in the single girl's place? Or guy who is seeing someone else?
What would you do when someone says we'd look cute together?
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