The band had appealed for extras to feature in the clip for their next single, which was shot in Hollywood - and the video is also set to star two famous faces.
Dennings took to her Twitter.com account after the shoot and told fans, "So today I fulfilled my dream of being in a Hanson music video. With my soul sister Nikki Reed. Thanks, life!"
A post written by Taylor Hanson on the group's Twitter page declared, "This whole day was beyond anything we could hope for! Dreams fulfilled all around. I love this day!!"