The 38-year-old actress said on Wednesday's episode of "Jimmy Kimmel Live!" that she got a second-degree burn while trying to impress Shepard on the set of their 2010 movie "When in Rome" in Italy.
"We did a movie called 'When in Rome' probably four months into dating," Bell told host Jimmy Kimmel. "We rented a scooter motorcycle in Rome. We were driving around the city and we stop at a gas station and he's pumping gas and talking to me casually."
"He lifts my helmet up and he goes, 'Are you crying?' I was sobbing," she recalled.
"He's like, 'What happened?' I'm like, 'I burned my leg on the motorcycle and I didn't want to tell you.' He's like, 'How long ago?' I'm like, 'Four miles!'"
Bell said she burned her leg after unintentionally touching the side of the bike.
"It burnt a hole through my linen pants and gave me a very serious second-degree burn -- the muscle was exposed," she said.
"But I was so desperate because he'd said to me as we stepped onto that bike, 'Careful about your legs on the side, it gets really hot.'"
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Bell also said she got her motorcycle license to impress Shepard during their early relationship.
The couple married in October 2013, and are parents to two daughters, 5-year-old Lincoln and 3-year-old Delta.
"They are stubborn as all get out," Bell said of Lincoln and Delta at the premiere of "Like Father" last week. "They get that from me."
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