Female friend called me pretty out of nowhere?

So me and y female friend were having dinner with mutual friends after dinner we went to the park. At the park we started to get into a conversation/debate then she randomly said I was pretty while we were both looking at each and making eye contact. I was thrown off by the comment because I never been called "pretty" before as a male. Is this a normal behavior?
Normal
Not normal
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Female friend called me pretty out of nowhere?
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