The 37-year-old actress shared on her Instagram page on Thursday a video of her posing with a group of people as part of a sponsored ad for the yoga and wellness business Gaiam.
"When the team turns it ON for the @gaiam camera. ❤️ #TBT on set with @karayoshimotobua @robzangardi and @hairbyadir," Biel wrote.
"Squad! [heart eyes emoji]!" Timberlake commented.
It marked her first post since the 38-year-old singer and actor sparked cheating rumors late last month over paparazzi photos that showed him and 30-year-old actress Alisha Wainwright, his co-star in the new film Palmer, looking cozy at a New Orleans bar.
A source later told E! News that "there is absolutely nothing going on between them," and the actor himself issued a rare personal statement on Instagram last week.
"A few weeks ago I displayed a strong lapse in judgement - but let me be clear - nothing happened between me and my costar," he said. "I drank way too much that night and I regret my behavior. I should have known better. This is not the example I want to set for my son. I apologize to my amazing wife and family for putting them through such an embarrassing situation, and I am focused on being the best husband and father I can be. This was not that."