"We did all of our love scenes in one day and I chipped a tooth and I lost a tooth, isn't that disgusting?" she said.
"We're smashing our faces together, it's not the slowest, most romantic love scene," she said of one "Good Luck" embrace, Extra reported.
Alba appeared at Sunday's Teen Choice Awards in California where she was named a "hottie."
"It's not about being skinny, it's about being healthy," she told her audience. "It's about loving yourself, being proud of who you are and proud of how God put you together."