Is She Really Going Out With Him?

8/28/2009 2:00 PM PDT BY TMZ STAFF
Here's Speedo-lovin', diminutive designer Roberto Cavalli, 68, with a twenty-something model yesterday in Italy (left) -- and supermodel Paulina Porizkova with her full-bodied hubby of 20 years Ric Ocasek earlier this month (right).

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We have just one question: Which couple is more mind-boggling?