Is it okay to tell a married woman that she's beautiful?

A woman I know is in her thirties, and she is stunningly gorgeous. She's married, and I've met her husbands on a few occasions, and he's a nice guy. I almost called her beautiful once when her husband wasn't present, but stopped because I didn't want to seem like I was hitting on her.
So the question is, is it appropriate to tell a married woman she's beautiful in a complimentary way?
Yes, it's okay
No, it's not okay
Select gender and age to cast your vote:
Is it okay to tell a married woman that she's beautiful?
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