Ashton's Alleged Mistress I Didn't Torpedo His Marriage!

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Sara Leal -- the 22-year-old blonde who allegedly slept with Ashton Kutcher this summer -- insists she isn't responsible for the actor's crumbling marriage to Demi Moore ... telling TMZ, she was just a "bump in the road."

Sara tells us, Ashton and Demi were having problems long before she came along -- but was she the straw that broke the camel's back?