Catherine Zeta-Jones was feeling nostalgic on Sunday as she marked a very special occasion in her family.MORE: Catherine Zeta-Jones rocks super short hair in epic throwback photoThe Chicago actress' firstborn son Dylan turned 21 and the star stayed up until midnight to welcome in his birthday.Taking to Instagram, Catherine shared a montage of never-before-seen photos and video of Dylan throughout the years, including footage of him dancing with his famous mom on holiday. VIDEO: Catherine