The couple's rare public appearance comes after Carla Bruni shared on Watch What Happens Live With Andy Cohen what it's been like having Olsen as a sister-in-law for the past two years.
"She's my husband's brother's [wife], but I didn't go to the wedding!" said Bruni -- whose husband, Nicolas Sarkozy, is the half-brother of Olsen's spouse. "They invited us, and then we couldn't go because of a stupid reason, geographical reason, you know, we had to come over here and we couldn't. But I mean, he seems so happy."