Los Angeles: Actress Jessica Biel says motherhood is the "most challenging job in the world". The “Total Recall” star, who has a son Silas Randall with her husband and singer Justin Timberlake, shared that motherhood can be stressful at times, reports ok.co.uk. "It is sometimes hard to find the words to describe motherhood. So amazing. So lovely. I'm over the moon. Honestly, I would say motherhood is the most difficult role I've done. It's probably the most challenging job in the world, but also the most joyous,” Biel said. The actress is thankful for the support of her husband. "Justin is a funny, sweet and caring dad, everything and more. I'd call him the perfect parenting partner,” she added.