My friends mom is flirting with me, should I tell my friend about his mom?

Anonymous
My best friends mom is amazingly hot, she could be a swimsuit model, but it's his mom, and she is married, she is 39 and married a wealthy 55 year old. He is a pretty cool guy and we all get along but she flirts and always comes out I a skimpy bathing suit when I am over swimming, she loves to take my hand and hold it and even caught her checking me out. I'm flattered and she is hot but no way I'm going to betray my friend, should I talk to him about it?
My friends mom is flirting with me, should I tell my friend about his mom?
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