Mayer and Simpson -- When in Rome

3/9/2007 1:21 PM PST BY TMZ STAFF
Jessica Simpson and her troublingly-tressed borefriend, John Mayer, were spotted in Rome yesterday. The pair spent the last couple of days vacationing in the eternal city and solidifying their relationship as a couple... of brunettes.

Jessica, wearing five-inch heels, nearly toppled over when her boot got caught in a cobblestone walkway. It's possible that she was nearly half-asleep after spending time with ..........ZZZZZZzzzzzzzzzzzzzzzzzz