She has enjoyed a life of being a mother, actress, dancer, and television host.But through all the successes, Jenna Dewan admitted that one of the best things she has ever had the pleasure in partaking in is seeing her fiance become a father.The 39-year-old star looked stunning as she cuddled with 18-day-old son Callum in a sweet snap posted onto her Instagram Story on Tuesday.Though she definitely seems to be enjoying the experience of being a mother for a second time, Jenna has been most enamored in observing 44-year-old fiance Steve Kazee become a dad for the first time.Scroll down for video 'Good day': Jenna Dewan looked stunning as she cuddled with 18-day-old son Callum in a sweet snap posted onto her Instagram Story on TuesdayJenna.